This is the Henderson 7mm Aqualock Quikdry Scuba Diving Booties Features: Quick Dry interior provides exceptional comfort and ultra-fast dry times Quick Dry Lining makes drying the boots fast and hassle free. Water Entry Barrier (WEB) eliminates water entry through the zipper area. Liquid Taped Seams, provide waterproof integrity, superior warmth and long durable life. Vulcanized Toe and Heel Caps provide maximum durability and long life. PK #10 Zipper for long durable life. Zipper stop assure remains closed during use Designed as part of the Aqua Lock system, these Boots utilize the same construction techniques employed by all Aqua Lock Wetsuits. Every seam on the boots are first double glued and blind stitched inside and out. Then the outer seam is coated with a special waterproof Aqua Lock liquid tape barrier which seals the seam from water entry and also helps protect the stitching from damage and unraveling. The interior of the Aqua Lock boots are lined with a Quick Dry lining which dries quickly and feels luxurious against the skin. It also improves the ease of putting on and taking off the boots.