Revolutionary, original collar design for maximum comfort and safety. The neoprene collar is soft, won't rub your dog's coat and dries quickly. Its click fastener is curved to ensure a more ergonomic fit, and sizes M and L feature a double-turn design to absorb the dog's force when pulling on the leash. The leash attachment ring is made of heavy-duty stainless steel. MATERIALS: Polyester. Neoprene. Plastic click closure. Stainless steel rings.