The ankle part is made of soft Neoprene ?VERY STRONG AND SAFEThis SUP leash is made of super strong 7mm urethane cord to handle the longest and heaviest of board, with precision molded-in double stainless steel swivels to prevent tangling, plus a triple wrap rail saver for board protection. Designed in California, tested and thrashed by WOOWAVE to withstand rigorous use. ?COMFORTABLE AND ADJUSTABLEThe super comfortable high density neoprene padded 2.5" ankle cuff is against your skin for an irritation-free fit for long days in the water, adjustable strap for perfect fit with strong velcro, make sure cuff won't slide around on your ankle, prevent blistering and chafing, an easy pull tab and a hidden key pocket included in it. ?DURABLE STRUCTUREConnection hardware made of durable marine-grade stainless steel, which can be able to resist the sea water corrosion for a very long time. ?COMING WITH A WATERPROOF POUCHSpecifically designed to solve the problem of your phone, keys and wallet when you get to the water. It combines an IXP8 sealable waterproof case with a simple belt, can be worn around your neck.