The product description 1. Recommended by veterinarians and trainers, the best design for everyday wear. To avoid running away and correct behavior, dog training gives you gentle control over your pet. Martingale collars are a better choice for standard collars. 2. [Durability] Silk soft polyester ribbon dog collar, strong and durable, will not loose or wear; Strict drawing test is carried out before production. Properly fitted, the collar will be comfortably loose as long as the dog does not pull on the leash. 3. [Warning] Quick release of clasp - can be quickly opened in case of emergency. Martingale collar not suitable for lashing. Don't leave your dog uncollared. This product is not recommended/designed for beltless use, not for indoor use 4. [Exact measurement] Make sure there are only 2 fingers between the collar and the dog's neck. Especially for dogs with poor vision, choose a collar that is large enough to slide over the head (the right collar doesn't leave any room for your dog to chew on, and pets won't slide out of their collar)."