Our Biothane dog collars are designed for professional K9 handlers in military, police, working, and protection dog services. Biothane is a durable, waterproof material that's made of a specially coated webbing that is extremely strong and lightweight. Biothane does not become compromised when it gets wet, nor will it develop a mildew smell from exposure to wet conditions. This ultra-strong material is a great alternative to leather and makes our tactical dog collars among the best in the world.