9902.13.92

Acrylic fiber tow containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, raw white (undyed), crimped, with an average decitex of 3.3 (plus or minus 10 percent) and an aggregate filament measure in the tow bundle between 660,000 and 1,200,000 decitex, with a length greater than 2 meters (provided for in subheading 5501.30.00)

Acrylic filament tow (polyacrylonitrile tow), containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed, presented in the form of bundles of crimped product each containing 214,000 filaments (plus or minus 10 percent) with an average decitex of 2.75 (plus or minus 10 percent) and length greater than 2 meters (provided for in subheading 5501.30.00)

Acrylic filament tow (polyacrylonitrile tow) containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed, presented in the form of bundles of crimped product each containing 214,000 filaments (plus or minus 10 percent) with an average decitex of 3.3 (plus or minus 10 percent) and length greater than 2 meters (provided for in subheading 5501.30.00)

Acrylic filament tow containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not more than 8 percent of water, dyed, such tow with a decitex of 5.0 to 5.6, an aggregate filament measure in the tow bundle between 660,000 and 1,200,000 and a length greater than 2 m (provided for in subheading 5501.30.00)

Acrylic filament tow containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, such tow dyed and presented in the form of bundles of crimped product each containing 315,000 to 360,000 filaments, with each filament of 3.3 decitex and with a length greater than 2 m (provided for in subheading 5501.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing at least 85 percent by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with an average decitex of 3.0 (plus or minus 10 percent) and fiber length of 50 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Modacrylic staple fibers containing 35 percent or more but not over 85 percent by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, not pigmented (ecru), crimped, with an average decitex of 2.2 (plus or minus 10 percent) and fiber length of 38 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Modacrylic staple fibers containing 35 percent or more but not over 85 percent by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, not pigmented (ecru), crimped, with an average decitex of 2.2 (plus or minus 10 percent) and fiber length of 51 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Modacrylic staple fibers containing 35 percent or more but not over 85 percent by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, not pigmented (ecru), crimped, with an average decitex of 1.7 (plus or minus 10 percent) and fiber length of 51 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Acrylic staple fibers containing at least 85 percent by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, raw white (undyed), crimped, with an average decitex of 1.3 (plus or minus 10 percent) and fiber length of 38 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, dyed (not pigmented), crimped, with an average decitex of 1.3 (plus or minus 10 percent) and fiber length of 40 mm (plus or minus 10 percent) (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, non-pigmented (ecru), crimped, with a decitex between 1.98 and 2.42 and fiber length between 48 and 60 mm (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 40 and 47.5 mm, certified by the importer as having a solar reflectance index less than 10 (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 40 and 47.5 mm, certified by the importer as having a solar reflectance index between 10 and 30 (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 40 and 47.5 mm, certified by the importer as having a solar reflectance index greater than 30 (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 48 and 60 mm, certified by the importer as having a solar reflectance index less than 10 (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 48 and 60 mm, certified by the importer as having a solar reflectance index between 10 and 30 (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 48 and 60mm, certified by the importer as having a solar reflectance index greater than 30 (provided for in subheading 5503.30.00)

Modacrylic staple fibers containing by weight 2 percent or more but not over 3 percent of water, not pigmented (ecru), crimped, with a decitex of 1.7 and fiber length of 38 mm (provided for in subheading 5503.30.00)

Acrylic staple fibers (polyacrylonitrile staple), not dyed and not carded, combed or otherwise processed for spinning, containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, with a decitex of 5.0 to 5.6 , with a fiber shrinkage of 0 to 22 percent and with a cut fiber length of 80 mm to 150 mm (provided for in subheading 5503.30.00)

Modacrylic staple fibers, not carded, combed or otherwise processed for spinning, containing over 35 percent and less than 85 percent by weight of acrylonitrile, 2.7 decitex (plus or minus 2 percent), natural in color, with fiber length between 38 mm and 120 mm (provided for in subheading 5503.30.00)

Modacrylic staple fibers, not carded, combed or otherwise processed for spinning, containing over 35 percent and less than 85 percent by weight of acrylonitrile, 3.9 decitex (plus or minus 2 percent), natural in color, with fiber length between 38 mm and 120 mm (provided for in subheading 5503.30.00)

Acrylic staple fiber (polyacrylonitrile staple), dyed, not carded, combed or otherwise processed for spinning, the foregoing containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, with a decitex of 3.3 to 5.6, a fiber shrinkage of from 0 to 22 percent (provided for in subheading 5503.30.00)

Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning and containing 28 percent or more but not over 33 percent by weight of silica (provided for in subheading 5504.10.00); the foregoing other than fibers measuring 2.2 decitex in lengths of 38 mm, measuring 4.7 decitex in lengths of 51 mm or measuring 3.3, 4.7 or 5.0 decitex in lengths of 60 mm

Staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, measuring 0.90 or more but not over 1.30 decitex and having a fiber length each measuring 20 mm or more but not over 150 mm (provided for in subheading 5504.10.00)

Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, measuring 0.5 or more but not over 1.0 decitex and having a fiber length each measuring 4 mm or more but not over 20 mm (provided for in subheading 5504.10.00)

Flame resistant viscose rayon fibers suitable for yarn spinning, with minimum fiber tenacity of 25 cN/tex, based on modal fiber derived from beechwood and containing 20 to 22 percent by weight of phosphorus-based flame retardant agent (provided for in subheading 5504.10.00)

Viscose rayon staple fibers having a decitex of less than 5.0 and a trilobal multi-limbed cross-section, the limbs having a length-to-width aspect ratio of at least 2:1, suitable for use in producing goods of heading 9619 (provided for in subheading 5504.10.00)

Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, such fibers containing between 28 percent and 33 percent by weight of silica, measuring 4.7 decitex in lengths of 60 mm (provided for in subheading 5504.10.00)

Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, such fibers containing between 28 percent to 33 percent by weight of silica, measuring 3.3 decitex, in lengths of 60 mm (provided for in subheading 5504.10.00)

Artificial staple fibers, not carded, combed or otherwise processed for spinning, of viscose rayon, containing between 28 percent and 33 percent by weight of silica, measuring 5.0 decitex in lengths of 60 mm (provided for in subheading 5504.10.00)

Artificial staple fibers, not carded, combed or otherwise processed for spinning; of viscose rayon, such fibers containing between 28 percent and 33 percent by weight of silica, measuring 2.2 decitex in 38 mm lengths (provided for in subheading 5504.10.00)

Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning, containing between 28 and 33 percent by weight of silica, measuring 4.7 decitex in 51 mm lengths (provided for in subheading 5504.10.00)

Artificial staple fibers of lyocell, not carded, combed or otherwise processed for spinning, measuring 1.7 or more but not over 3.3 decitex and having a fiber length each measuring 25 mm or more but not over 51 mm and containing 25 percent by weight of kaolin (provided for in subheading 5504.90.00)

Acrylic staple fibers, carded, combed or otherwise processed for spinning (provided for in subheading 5506.30.00); the foregoing other than such acrylic staple fibers containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed or raw white (undyed), with an average decitex of 2.75 to 3.30 or of 11 (plus or minus 10 percent) or if dyed with an average decitex of 5.0 to 5.6

Acrylic staple fibers, carded, combed or otherwise processed for spinning, containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed or raw white (undyed), with an average decitex of 2.75 to 3.30 (plus or minus 10 percent) (provided for in subheading 5506.30.00)

Acrylic staple fibers, carded, combed or otherwise processed for spinning, containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, such fibers dyed or raw white (undyed), such fibers with an average decitex of 11.0 (plus or minus 10 percent) (provided for in subheading 5506.30.00)

Acrylic staple fibers, carded, combed or otherwise processed for spinning, containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, dyed, with an average decitex of 5.0 to 5.6 (provided for in subheading 5506.30.00)

Staple fibers of rayon, carded, combed or otherwise processed for spinning, the foregoing presented in the form of top (provided for in subheading 5507.00.00)

Woven fabrics of synthetic staple fibers, containing 85 percent or more by weight of polyvinyl alcohol staple fibers and up to 15 percent of polynosic rayon fibers (provided for in subheading 5512.99.00)

Woven fabrics of modal staple rayon fibers, containing over 50 percent but less than 85 percent by weight of such fibers, dyed, mixed mainly or solely with cotton, such fabrics weighing more than 270 g/m2 but not more than 340 g/m2, of yarns of number 42 or lower number, of a thread count of 150 to 160 per cm2, napped (provided for in subheading 5516.42.00)

Carpets and other textile floor coverings, tufted, whether or not made up, of wool or fine animal hair, hand-hooked, that is, in which the tufts were inserted by hand or by means of a hand tool that is not power-driven (provided for in subheading 5703.10.20)

Polyethylene Terephthalate (PET) heat exchange capillary material consisting of parallel PET tubes arranged and secured in a knitted fabric of PET threads (provided for in subheading 6003.30.60)

Men's shirts of man-made fibers, knitted or crocheted, with textile- or polymer-based electrodes knitted into or attached to the fabric, incorporating two snaps designed to secure a module to transmit heart rate information from the electrodes to a compatible monitor (provided for in subheading 6105.20.20)

Tank tops of knitted fabric of man-made fibers, containing elastomeric fibers, each such top with textile or polymer-based electrodes knitted into or attached to the fabric and that incorporates two snaps designed to secure a module designed to transmit heart rate information from the electrodes to a compatible monitor (provided for in subheading 6109.90.10)

Women's or girls' knitted or crocheted vests of man-made fibers, containing 23 percent or more by weight of wool, each with fabric stitch count greater than 9/2 cm, measured in the direction the stitches are formed (provided for in subheading 6110.30.15)

Vests (other than sweater vests) for men, knitted or crocheted, of man-made fibers, with textile or polymer-based electrodes knitted into or attached to the fabric and incorporating two snaps designed to secure a module to transmit heart rate information from the electrodes to a compatible monitor (provided for subheadings 6110.30.30)

Men's or boys' knitted or crocheted pullovers and cardigans, containing 70 percent or more by weight of silk, each with more than 9 stitches/2 cm, measured in the direction the stitches were formed, and an average of less than 10 stitches/linear cm in each direction counted on an area measuring at least 10 cm by 10 cm, such apparel articles that reach the waist (provided for in subheading 6110.90.10)

Men's or boys' knitted or crocheted sweaters of linen, each with 9 or fewer stitches per 2 centimeters measured in the direction the stitches were formed (provided for in subheading 6110.90.90).

Girls' knitted or crocheted coveralls or jumpsuits, of cotton (provided for in subheading 6114.20.00)

Socks with uppers comprising neoprene measuring 2.5 mm in thickness and covered on both sides with jersey knitted fabric of nylon; such socks with underfoots of breathable neoprene measuring 2.5 to 3 mm in thickness and covered on both sides with a jersey knitted fabric of nylon; the foregoing each formed anatomically so as to be designed for the wearer's left or right foot (provided for in subheading 6115.96.90)

Socks of synthetic fibers, with uppers of neoprene measuring 3.5 mm in thickness and covered on both surfaces with knitted jersey fabric of nylon; each such sock having an integrated fold-down cuff of knitted jersey fabric of nylon, each cuff with a molded hook to allow connection to wading boot and designed to prevent debris and gravel from getting inside wading boot, such socks anatomically formed (provided for in subheading 6115.96.90)

Training gloves of vulcanized rubber other than of hard rubber (provided for in subheading 4015.19.50) or of synthetic textile materials (provided for in subheading 6116.93.08), such gloves of textile materials knitted or crocheted

Hand muffs of knitted fabrics of polyester coated with plastics, such muffs stuffed with synthetic microfiber for thermal insulation, each with side openings having elastic closures, with one exterior pocket with zipper closure and weighing not more than 453.592 g (provided for in subheading 6117.80.95)

Boys' woven man-made fiber coats, containing 36 percent or more by weight of wool, thigh length or longer, with sleeves, with or without closure and with full front opening (provided for in subheading 6201.13.30)

Men's or boys' jackets of woven cotton corduroy, less than mid-thigh in length, with long sleeves, with full or partial front opening (provided for in subheading 6201.92.45)

Boys' woven jackets of man-made fibers, containing 36 percent or more by weight of wool, less than mid-thigh in length, with long sleeves, with full or partial front opening (provided for in subheading 6201.93.55)

Women's or girls' woven padded sleeveless jackets (including vests) of wool, less than mid-thigh in length, with full opening (provided for in subheading 6202.91.60)

Girls' woven jackets of man-made fibers, containing 36 percent or more by weight of wool, less than mid-thigh in length, with long sleeves, with full or partial front opening (provided for in subheading 6202.93.45)

Women's dresses, woven, wholly of silk (provided for in subheading 6204.49.10)

Women's skirts and divided skirts, wholly of silk (provided for in subheading 6204.59.40)

Women's blouses, shirts and shirt-blouses, woven, wholly of silk (provided for in subheading 6206.10.00)

Men's or boys' woven sleepwear of man-made fibers, the foregoing comprising tops and sleepwear bottoms presented separately and not in sets, the foregoing designed to be worn in bed (provided for in subheading 6207.99.85)

Babies' woven trousers of artificial fibers, other than those imported as parts of sets (provided for in subheading 6209.90.20)

Babies' woven apparel of linen (provided for in subheading 6209.90.90)

Women’s sports bras of knitted or woven fabric containing elastomeric fibers but not containing lace, net or embroidery, such goods whether assembled or knitted/crocheted in the piece, each with textile or polymer-based electrodes knitted into or attached to the fabric and incorporating two snaps designed to secure a module designed to transmit heart rate information from the electrodes to a compatible monitor (provided for in subheading 6212.10.90)

Women's shawls, scarves and similar goods, wholly of silk (provided for in subheading 6214.10.10)

Batting gloves of man-made fibers, specially designed for use in the sport of baseball, with a strap that wraps around the wrist and the back of the hand to secure the glove to the wrist (provided for in subheading 6216.00.46)

Mechanics' work gloves, not knit, of man-made fibers, with fourchettes, the foregoing not containing 36 percent or more by weight of wool or fine animal hair (provided for in subheading 6216.00.58)

Pocket pouches with outer shell of woven textile fabric laminated to an inner layer of knitted fabric, each such pouch with a zippered cargo pocket and other pockets designed to organize tippets and leaders and with dual entry zippers; the foregoing designed to be zipped into fishing waders (provided for in subheading 6217.90.90)

Sacks and bags, of undyed woven fabric of nylon multifilament yarns, such yarns not exceeding 10 decitex, the foregoing bags designed for use for packing wool for transport, storage or sale (provided for in subheading 6305.39.00)

Sleeping bag shells, unfilled, of woven taffeta fabric of polyester with thread count between 160 and 210 and formed from yarns between 22 and 112 decitex; such shells each weighing 25 g/m2 or more but not over 250 g/m2; measuring 152 cm to 305 cm in length, with zipper closure, valued not over $7 each (provided for in subheading 6307.90.98)

Nonwoven radial segment and chordal orientation brake segments of oxidized polyacrylonitrile fibers, made up and presented as cut otherwise than into squares or rectangles, such segments formed by needling web and unidirectional tow fabrics together, the foregoing designed for use in aircraft braking systems (provided for in subheading 6307.90.98)

Bins of laminated woven fabric of polypropylene, rectangular or square in shape, collapsible and stackable, measuring 28 liters or more but not over 256 liters in volume and 63.5 cm or less in height, each with sewn-in cardboard inserts and fabric top panel with sewn-in cardboard insert, such panel secured to the bin with cut-to-length strips of hook-and-loop material, such bins each having a fold-down fabric panel with sewn-in cardboard insert, such panel sewn into the interior of the bin; such bins certified by the importer as meeting ASTM D642-15 standards (provided for in subheading 6307.90.98)

Smartphone cases, each attached to integral adjustable armbands wholly of textile materials, with such case of polyester-laminated neoprene, incorporating a clear plastic window for visual access to the smartphone screen and a small opening for headphone wires, whether or not with decorative plastic overlay (provided for in subheading 6307.90.98)

Portable and foldable water or food bowls of textile materials, designed for use by pets (provided for in subheading 6307.90.98)

Agricultural control nets specially designed to protect mandarin trees from bee pollination, such nets of high density polypropylene monofilament, with interspersed eye knots at regular intervals; each net measuring approximately 441.5 m by 12.8 m or 274.3 m x 12.8 m, having finished edges, presented in rolls (provided for in subheading 6307.90.98)

Chest harnesses of textile materials, each designed for attaching cameras of subheading 8525.80.40 to a user's chest; incorporating a waist belt and shoulder straps, each with a plastic connector and thumb screw designed for camera mounting or adjustment (provided for in subheading 6307.90.98)

Adjustable straps of textile materials, designed with small plastic mounts intended to secure cameras of subheading 8525.80.40 to helmets or to other articles (provided for in subheading 6307.90.98)

Textile bags of woven fabric of polyester and coated with thermoplastic polyurethane, each pleated and attached to a ring of plastics and/or metal with internal threads, with a washer and a plastic cap with external threads that screws into the ring to form an expandable circular shaped bag, designed to hold ice and/or cold water (provided for in subheading 6307.90.98)

Mounts of textile materials, designed to attach cameras of subheading 8525.80.40 to a user's wrist, arm or leg; such mounts incorporating hook-and-loop adjustable straps and designed to permit adjustment of the camera viewing angle 360 degrees on the mounted plane and of the camera tilt against that plane (provided for in subheading 6307.90.98)

Made-up color swatches, of cotton, rectangular in shape and each measuring approximately 5.08 cm by 20.32 cm, with pinked edges, such swatches dyed using certified dye colors and each having a bar code to specify its color (provided for in 6307.90.98)

Sports footwear, with outer soles and uppers of rubber or plastics, valued over $12/pair, other than for men (provided for in subheading 6402.19.90)

Men's work footwear with outer soles and uppers of rubber or plastics, covering the ankle and having an oil-resistant and slip-resistant outer sole (provided for in subheading 6402.91.40)

Protective active footwear for men (except footwear with waterproof molded bottoms, including bottoms comprising an outer sole and all or part of the upper and except footwear with insulation that provides protection against cold weather) whose height from the bottom of the outer sole to the top of the upper does not exceed 15.34 cm (provided for in subheading 6402.91.42)

Protective active footwear for women, with outer soles and uppers of rubber or plastics (except footwear with waterproof molded bottoms, including bottoms comprising an outer sole and all or part of the upper and except footwear with insulation that provides protection against cold weather) whose height from the bottom of the outer sole to the top of the upper does not exceed 15.34 cm (provided for in subheading 6402.91.42), such footwear, if valued at $26/pr or higher, without openings in the sole or upper designed to vent moisture

Protective active footwear for women, with outer soles and uppers of rubber or plastics (except footwear with waterproof molded bottoms, including bottoms comprising an outer sole and all or part of the upper ,and except footwear with insulation that provides protection against cold weather), whose height from the bottom of the outer sole to the top of the upper does not exceed 15.34 cm, covering the ankle, valued over $26/pr; where such protection is imparted by the use of a laminated textile fabric, such footwear with openings in the bottom and/or side of the sole, or covered openings in the upper above the sole unit, or a combination thereof, designed to vent moisture (provided for in subheading 6402.91.42)

Footwear for men, with outer soles and uppers of rubber or plastics (except vulcanized footwear and footwear with waterproof molded or vulcanized bottoms, including bottoms comprising an outer sole and all or part of the upper, and except footwear designed to be protective that is incomplete in its condition as imported), valued over $25/pair, whose height from the bottom of the outer sole to the top of the upper does not exceed 25.4 cm, designed to be worn in lieu of, but not over, other footwear as a protection against water, oil, grease or chemicals or cold or inclement weather where such protection includes protection against water that is imparted by the use of a laminated, but not coated, textile fabric; such footwear, if valued over $27, without openings in the bottom and/or side of the sole or covered opening in the upper designed to permit moisture vapor transport from under the foot (provided for in subheading 6402.91.50)

Footwear for men, with outer soles and uppers of rubber or plastics (except vulcanized footwear and footwear with waterproof molded or vulcanized bottoms, including bottoms comprising an outer sole and all or part of the upper; and except footwear designed to be protective that is incomplete in its condition as imported), valued over $27/pair, whose height from the bottom of the outer sole to the top of the upper does not exceed 25.4 cm, designed to be worn in lieu of, but not over, other footwear as a protection against water, oil, grease or chemicals or cold or inclement weather where such protection is imparted by the use of a laminated, but not coated, textile fabric; such footwear with openings in the bottom and/or side of the sole, or covered openings in the upper above the sole unit, or a combination thereof, designed to permit moisture vapor transport from under the foot (provided for in subheading 6402.91.50)