Coastal's New Earth Soy Dog leash is natural, strong and durable and features a blend of all-natural fibers including soy. It's a natural choice! These New Earth Soy Dog Leashes are made from a blend of all-natural fibers, featuring soy. A natural by-product of food manufacturing, soy fibers are soft, eco-friendly and have anti-bacterial properties. The soy fibers have a soft, cashmere feel that your pet will love.