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.