Keratex Hoof Gel keeps hoof horn water tight in wet weather, and stops cracking in dry weather. A powerful hydrophobic treatment that leaves the hoof glistening dry. Keratex Hoof Hardener repairs damage to the hoof horn's molecular structure caused by water and ammonia and allows the hoof to breathe. Air can pass freely through Keratex Hoof Gel and excess moisture can be expelled from the hoof.