Viper Biothane Working Tracking Lead Leash Long Line for Dogs 2 Colors and 6 Sizes,3/4" x 33ftLead with Purpose with the Viper Biothane Dog Leash. This robust webbed dog lead is specially coated to emerge from even the swampiest environments, dry and smell free, without loss of flexibility. Please note! This is *not* a chew proof material, not to be used for tie out! Excellent Performance. Biothane dog leash boasts a flexible substrate core bonded with a waterproof coating, perfect for environs where strength and cleanliness are crucial. It