A comfortable alternative to a choke collar Martingale loop prevents dogs from backing out of collar and escaping Recommended by vets and trainers as the best design for daily wear Made from high-quality, durable nylon Call, chat or email with our expert US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs PetSafe brand has been an industry leading US manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year