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 U.S.-BASED CUSTOMER CARE: Our pet product experts are here to help you and your pet and are available by phone, email or chat if you have any questions 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