(Back on Track) This Hock Boot has a neoprene exterior lined with state-of-the-art fabric that contains polyester thread embedded with a fine ceramic powder. Designed to reflect the horse's own body-warmth, it creates a soothing far infrared thermal heat, which can help alleviate pain associated with inflamed muscles, ligaments, tendons and joints. Used for both injury prevention as well as injury recovery. Achieve great results when using for boggy hocks and arthritic joints. Back on Track products are not to be compared with magnetic therapy. This therapy works with your horses own body heat. Hock Boots have no holes for hock points. Medium. Sold as pair.