keeps hold of your sled as you climb the hills. acts as a safety cord to avoid runaway sleds well-constructed nylon and rubber elastic strap The Zipfy leash is a well-constructed nylon and rubber elastic strap that attaches to the Zipfy Classic handle via industrial velcro on one end and via a thick elastic cord and clip on the rider's ankle or wrist on the other end. The leash is great for riders to keep hold of their sled as they climb the hills. and also acts as a safety cord to avoid runaway sleds. Sled sold separately