Lightweight, soft, and flexible. Reinforced nylon webbing. Featuring an adjustable head strap with a quick fit catch. Cannot be removed by the animal. Won't catch hair. Allows animal to drink or regurgitate. Most comfortable for animal and handler. Not available in gray as shown, black only. Size 0 - tiny dogs, size 1 - small breeds, size 4 - extra large breeds, size 5 - Rottweilers & large muzzle breeds.