Choosing the right leash material affects durability, safety, weather performance, and how well your gear holds up in real-world conditions. While many dog owners default to nylon, rope, or leather, very few materials thrive in tough environments like the Pacific Northwest. That’s why trainers, hikers, rescuers, and working-dog handlers rely on BioThane® — a modern, waterproof material known for its strength, reliability, and ease of use. Here are the top 5 reasons BioThane® is the best leash material for dogs.