Non-stop dogwear Bungee Leash reduces strain on both you and the dog. Bungee Leash is developed for professional racing, but also works well for an active everyday. The bungee comes with a twist-lock carabiner. The carabiner locks automatically. The carabiner rotates so the bungee will not twist. Bungee Leash comes in two sizes. 2m works well for hiking and running, while 2,8m works well for biking and skiing.