Cosy pony medium under rug the cosy pony medium under rug is designed to be worn underneath a rug to provide extra warmth and comfort while your horse is stabled this snug polycotton rug features cosy channel quilting a warm 250gm filling adjustable chest strap fastenings a single surcingle to hold it secure and d rings for optional leg straps or fillet string the cosy pony medium under rug is ideal for boosting the warmth of an existing rug during colder weather please note