Premier/PetSafe Martingale style safety humane dog collars are designed to control and resist the forces when a dog becomes excited and bolts out of a standard buckle collar. The martingale restrains the dog from slipping out or backing out of a collar without injury to the dog’s neck. The Premier/PetSafe Martingale Collar hardware is solid steel chrome plated. The fabric is a soft ballistic nylon web and extremely durable for everyday wear. The collar is adjustable, will not collect hair and machine wash/dry for easy care.