Heavy weight, fire retardant, heat resistant, 3.25 to 4.0 oz., midnight blue Koala® Tanned cowhide. Koala® Tanned leather will remain soft after repeated soakings. This barrier fabric is combined (laminated) to the thermal liner. The breathable barrier/ thermal liner system is individually graded and produced in as many sizes as glove sizes. The barrier/thermal liner systems are sized proportional to human hand sizes. Thread: Sewn with high burst strength Kevlar (30/5) lock stitch, 8-10 stitches per inch. Hanger loop: ¼" fire retardant, split cowhide, hanger loop.