Keratex Hoof Hardener formula is patented and includes a unique flexibility agent as well as a hardening agent, making this the perfect product to protect your horse from: brittle, cracked, soft or weak hooves; soft, sensitive or thin soles; repeated shoe loss; transition to barefoot; hoof damage. Keratex Hoof Hardener will strengthen and protect shod and unshod hooves, to restore soundness after sensitive soles and to prevent existing cracks from laddering up or across the hooves.