A Martingale is a type of collar that provides more control over the dog without a choking effect. Martingales are a very popular choice for dog trainers as they are not a severe as choke chain collars. The Martingale collar has a loop on loop system with limited closure that prevents the collar from becoming too tight. It also provides positive reinforcement and helps keep your dog from slipping away. They are perfect for dogs that pull on the lead or slip out of regular collars. Our martingale collars are made of high-density Nylon webbing, anti-rust zinc alloy hardware and reflective stitching to increase your dog's visibility at night. Best of all they are washable!