Made with GREENPRENE 100% neoprene-free sustainable insulating foam. Third party tested and approved by the United States Department of Agriculture (USDA) Bio Preferred program as a USDA Biobased product. Bio-Span interior fabric laminate is made from recycled water bottles. Aqua Silk exterior fabric laminate is ultra durable, abrasion and Velcro resistant. Super soft, high stretch Greenprene core. 250% stretch assures a perfect fit. Ultra plush and comfortable. Silicone palms ensure a secure grip