Ok so I thought I would follow up to this thread since I finally decided to try out the Simple boots, based on feedback here and from tack shops I've visited. I bought a pair for my mare's front hooves.
I must say, they do stay on MUCH better than I thought they would!! I imagined the velcro coming undone all the time, but I've used them out on trail with my mare twice now -- we've tested them at a walk, trot, canter, gallop, and jumping and they've held up and stayed on so far! Oh and through a creek...love that they have holes around the base to drain water out!
My one complaint is as others have said, that they can rub a little, at the back base of the hoof. Nothing major, but enough to bug me of course. I tried putting vet wrap just around that part of her hoof, but the darned things pushed it up and then proceeded to rub. I'll fix it next time, by just vet wrapping her whole hoof, that'll keep it in place! It's only one of her hooves so I'm guessing it's shaped just a little differently than the other one, because I'm having no issues with the other.
Anyone else have any helpful hints on how to prevent the rub?
Oh by the way, they seem true to their size chart too...my mare measured right in the size 2 and they fit her perfectly! Overall I'm very pleased with them!