Shires Nylon Grass Muzzle This nylon grazing muzzle will help limit the amount of grass your horse can eat, thus curbing overeating. It features a strong rubber base, with tough nylon web bars on the side, and a headpiece and throatlatch to keep the muzzle securely in place. Features: Helps curb overeating Quality nylon and rubber construction Headpiece and throatlatch for secure placement Item Specifications: Circumference: Cob Size: Bottom: 21" Top: 23.5" Full Size: Bottom: 22" Top: 27"