Secure & Gentle Training Tool: The PetSafe Martingale Collar offers gentle correction for pulling and improves better leash manners without the harshness of prong or choke chains Designed for Escape Prevention: Features a limited slip collar design that tightens gently when pulled and loosens when relaxed for safe effective control on walks Comfortable & Customizable Fit: Made from durable nylon with a comfortable soft fit and adjustable custom fit sizing for dogs with necks wider than their heads 25 Years of Trust: Since 1998, PetSafe has created safe, innovative, and trusted products that bring joy, enhance pet lives, and support the lifelong bond between pets and their families 25 Years of Trust: Since 1998, PetSafe has created safe, innovative, and trusted products that bring joy, enhance pet lives, and support the lifelong bond between pets and their families