The Sure Grip Seat is designed to add security and balance in the saddle for those hard running and quick turning horses, novice riders and young riders . Seat and leg straps come together as a set--order Extra Small, Small, Medium, Large or Extra Large. Size is determined by leg straps. To determine proper size, measure around upper thigh. Attaches to saddle and around thigh with velcro straps and fits most barrel saddles.