Best Friend (R) Deluxe Grazing Muzzles are recommended by equine health professionals to prevent, as well as treat, laminitis, founder, obesity, colic and other diet-related diseases. The small opening in the bottom allows horses a limited amount of grass, yet unlimited water. Rather than being restricted to a non-grass environment to control intake, horses are free to exercise and socialize as part of the herd. A combination grazing muzzle and breakaway halter all in one, the design utilizes a plastic side-release buckles as it"s breakaway feature. Each Deluxe muzzle comes with a spare buckle that can be easily attached in the field. To use, adjust The Best Friend(R) Deluxe Grazing Muzzle to the horse using the same principles as the fit of a comfortable halter. Leave approximately one inch between the horse"s mouth and the inside of the muzzle. The Deluxe muzzle has a roomy fit to allow for chewing. You should be able to fit two to three fingers sideways between your horse"s face and the muzzle. This is our most popular design because it is so easy to use and costs less than purchasing a separate breakaway halter. The rubber bottom in the grazing muzzle is approx. 1/4" thick. Your horse is happier as a result of not being kept away from both his grass and his outdoor buddies. Your horse can get the required exercise. (The average horse covers one mile per hour while grazing.) Disease prevention is easier and less expensive than a visit by the vet. All synthetic materials make it lightweight, rot resistant and well-ventilated. Padded noseband helps resist rubbing and chafing. Most durable, comfortable and safest grazing muzzle available. Recommended by John Lyon"s Perfect Horse and The Horse Journal . Reduces bedding bill and stall-cleaning time. You have peace of mind knowing your horse is happier and healthier. Sizing : Mini Larger miniatures, Shetlands and weanlings. 200-300 lbs. 20" circumference x 5 1/2" depth Pony Most average size ponies and yearlings, very