Cavallo Sport Boots do not impede the horse's natural movement; they can be used on narrow, rocky trails, through mud and water, at any pace, even over jumps. Anything your horse can do in shoes, your horse should be able to do in Cavallo Sport Boots (and maybe more!).
When using Cavallo Hoof Boots for the first time, it's a good idea to also use the Cavallo Pastern Wrap (sold separately). It's a little but like breaking in new shoes for us - if you horse isn't used to wearing boots, it may take some time for his pasterns and heels to get used to having something touching them. The Pastern Wraps help protect against rubbing that could occur when the boots are first used; some horses get used to wearing hoof boots very quickly and won't need the pastern wraps forever, but some horses will always be more comfortable wearing the wraps. Just be sure to break the boot in gradually - no 3 hour trail rides the first time you put them on! The Size Chart will help you figure out which boots will fit your horse best. If your horse's hooves are don't quite fit into the Original Simple Boot, the Sport might be the boot for you - they're a little bit narrower than the Simples. Please note that the Cavallo SPORT Boot runs about 1/4" (5mm) narrower that the original Simple boot, so keep that in mind when using the Simple Boot Size Chart.