XS Scuba's 8 mm Thug Boots are one extremely warm, well built, and durable cold water dive boot. Built-to-Last theses nylon ll neoprene rubber boots have glued and double blind stitched seams inside and out for strength and durability. The boots are equipped with a large #10-YKK zipper chain with YKK's best marine bronze zipper slider. The zipper is also equipped with a cold water dam, hook and loop tab zipper retainer and nylon zipper stops. The boots exterior surface is laminated with high abrasion resistant Ryno-Hide.