My horses experience the same hoof sensitivity when on rocks and gravel. They have healthy bare hoofs and are fine in the nice soft pasture and riding arena but need a little extra protection on terrain they are not accustomed to. Boots are the best way I have found to keep them comfortable and protected on the trails and still natural and barefoot, its also alot less expensive then keeping your horse shod all the time when you really only need protection when riding. I have tried ALOT of boots on the market and the Cavallo boots have been the easiest to use, the most durable and the most secure. I have never lost a boot (a problem I have found with some of the other boots out there) and have never caused rubbing or soreness on any of my horses. They are always my recommendation when someone is considering hoof boots, I don't leave home without them!