Martingale collars or Premier dog collars as they are sometimes called, were designed with your dog's comfort and safety in mind.  When a martingale collar is used with a leash or when you grasp the smaller loop like a handle, it gives you greater control with the safety of limited closure.  The martingale dog collar has a looser fit.  This reduces matting and bald spots and is more comfortable for your pet.  The adjustablility of martingale dog collars means that every dog gets a custom fit.  Martingale collars are available in 25 fun colors, 12 distinctive patterns and in the martingale /lead combo also known as a martingale leash.