Flat feet???? Underrun heels??? Horn tubules that are so long they are under the foot? No concavity of the sole?? Heel buttress 'landmarked' closer to the middle of the frog on both sides? Yes??? The above are all hallmark signs of a thin sole.. A thin sole is a sole that feels most terrain. While transitioning the hoof and growing heel back you can support the sole with Hoof Armor. Hoof Armor is designed to help strengthen your horses hooves, rather than weaken them. Like the natural varnish co