The Aqualung 3mm Superzip has an extra-thick sole, heavy-duty protective panel on the upper, and a durable zipper to withstand years of use without tearing. This is the boot for an avid diver who needs to be prepared for temperate water, rough terrain, less-than-luxurious boats, and murky, low-viz conditions that hide hazards. Ergonomic: Like the rest of the Aqualung boot line, the Superzip uses their patented, anatomically correct ERG shaped footbed and outsole to match the profile of your foot, preventing excess water retention and offering comfortable support. Protective: 8mm-thick treaded sole provides premium protection against punctures, stings, and slips. For added protection and durability, the panels on the heel cap, toe, and top of the foot are twice as thick as in the standard boots! Warm: 3mm neoprene upper for the right amount of warmth in warm and temperate conditions. Comfortable: The Superzip boot uses just a few seams, which are placed away from the widest parts of the feet to minimize chafing. The seams are glued and sewn for strength and durability. Eco-Conscious Packaging: Ships with minimal carbon footprint packaging. No plastic bags.Durable Closures:With a heavy-duty, non-corrosive #10 YKK toothed zipper. Elastic binding at the top resists wear and tear. Hook and loop zipper retainer tab. Boots are black in color and available in multiple sizes.