The pparkPets two-way collar is a dog collar that can be used in two different ways. One mode is for easy and relaxed walks and it works just as a common collar. When set in the other mode it becomes a Martingale collar, giving you a tighter grip when leading your dog. pparkPets Two-way Collar has 2 loops; when the smaller loop, which is the "control loop", is pulled, it tightens the larger loop to prevent a dog from slipping out of the collar. In the "normal leash" mode, you need to hook both metal rings to the snap clip of your leash and the collar won't slip any longer. Compared to a regular slip collar, our two-way collar has limited constriction on a dog's neck and applies even pressure, and that is why the no-slip feature has made this kind of collars a safety standard at many kennels and animal shelters. It does not make your dog choke or gag the way other slip training collars do. It still forces your dog to learn not to pull when walking, and that is why it is an excellent training collar. It gives you the features of a training collar, or slip collar, or choke collar, without having to give your dog any discomfort and it turns training into a fun experience rather than an unpleasant one. So, here you have a single collar that can be used for two different purposes without having to switch from one collar to another. And it is very easy to adjust the size and to switch from one mode to the other. The collar is made of high quality nylon woven in a very fine way in order to obtain a stronger, soft and silky fabric. The stitching is also sewn in the finest way possible and with a pattern specially studied to avoid any rough and stinging sensation when wearing it. The metal components are made with a reinforced alloy to prevent it from breaking and rusting. You can choose from 30 and more colors to match your leash. Five sizes available for best fitting.