Well-built with glued and double Blind stitched seams, strong non-corrosive #10-YKK Delrin Zipper with nylon zipper stop. For added strength the Boots have Nylon Edge Binding and Extended Toe and Heel Protection. All this make this boot tough enough for rental use and means durability. Warmth is achieved with 6 mm nylon II neoprene rubber, and a cold water zipper dam. The aggressive sure-grip sole keeps you stable on the slipper decks or rocks making these one great pair of boots.