Horseware's Amigo Stable Sheet Amigo Stable Sheets are designed to help keep your horse clean during the summer months. They are made from 100% durable cotton with a silky shoulder lining. Classic original cut, straight front closures and two criss-cross belly surcingles with tail cord keep this stable sheet in place. The Amigo Stable Sheet is machine washable. Coordinates with the entire Amigo line!