This is the XS Scuba 8mm Thug Zipper Boots Scuba Diving Booties Features: 8mm neoprene in all panels including sole High abrasion resistant RynoHyde exterior lamination Heavy-duty molded rubber sole Protective heel and toecap YKK's best marine bronze #10 zipper slider Velcro tab zipper retainer Glued and double blind stitched exterior and interior XS Scuba's 8mm Thug Boots are one extremely warm, well built, and durable, cold water dive boot. Built-to-last theses nylon-2 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.