This is the Aqua Lung 7mm Echozip Boot Scuba Diving Boots Features: Ergonomic: Like the rest of the Aqua Lung boot line, the Echozip uses our patented, anatomically correct ERGO(TM) 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. Warm: 3, 5 or 7mm neoprene upper for the right amount of warmth in any conditions. Comfortable: The Echozip boot uses just a few seams, which are placed away from the widest parts of the feet to minimize chafing. Durable Closes with a heavy-duty, non-corrosive #10 YKK toothed zipper. Elastic binding at the top resists wear and tear. Eco-Conscious Packaging: Ships with minimal carbon footprint packaging. No plastic bags. Designed for warmth, comfort, and protection the Echozip boots are geared for recreational divers who want to be prepared for many conditions, from varying water temperatures to uneven and hazardous terrain.