BioThane® is an incredibly durable and easy to maintain polyester webbing with a PVC coating. Fully waterproof and handmade in the USA. They are 100% waterproof and perfect for any outdoor adventure, whether you're going on a rainy day walk, hiking through the bush or headed to soak up some sun at the beach! Your BioThane dog lead will not soak up water, dirt or sand and will keep its vibrant colour.