Made with 3MM 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. Minimal seams and larger Greenprene panels, keep you warmer longer. Anatomical fit and patterns that have been proven in the Henderson pattern. Soft sealing collar with Closure dock. YKK accenting zipper with corrosion resistant metal slider