I have these for Chexs and Lucy. Lucy being as she is, refuses to wear boots at all, so am unable to comment there lol
Chexs, he has more round feet and splat feet. They fit well around the bottom of his hoof, but I need to really tighten the front strap and the back strap is nice and snug. He likes them he marches in them rather fast. Good grip for us down the tarmac hill, not noticed any slips down hill in grass or mud. We use them mainly for hacking on the roads.
Also used them to rehab a lami case, she more of less lived in them with pads. Was going really well, almost back to riding (after vet said we will lose her if we do not put heart bars on
) then we sold the farm, last I heard she had shoes on as owner CBA to put boots on and off......