Ergonomic: Like the rest of the Aqualung boot line, the Echozip uses our patented, anatomically correct ERGO™ 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.