Surfers listen up - this LINGVUM leash is exactly what you need to keep your board close and stay safe in the water. It's made from high-quality TPU material that's seriously tear-resistant and built to handle big waves and wipeouts without breaking. The cord diameter is 7mm (0.27 inches), which is strong enough for reliable protection but doesn't add extra drag when you're surfing. The double swivel joints are genius - there's one on the ankle cuff and another on the rail saver, both rotating 360 degrees so the leash doesn't tangle and you maintain maximum freedom on your board. The ankle cuff is super comfortable too, made from durable yet soft fabric with padding inside that prevents chafing and blistering. The rail saver has adjustable Velcro straps that make it quick and easy to attach to your surfboard. There's even a thoughtful small pocket design perfect for storing your car keys or coins. It comes in multiple lengths - 6, 7, 8, or 9 feet - so you can choose the right size for your board (they recommend matching the leash length to your board length). The connection hardware is marine-grade stainless steel that resists corrosion from saltwater. Whether you're riding a longboard, shortboard, or SUP, this leash provides the security and freedom you need to focus on catching waves rather than worrying about losing your board.