Join Date: Aug 2009
Location: New South Wales, Australia
They're made to protect the horse from knocks in the float. I personally don't use them, I'd worry about them catching on things and I don't know how much protection they offer.
However, I float my horse alone generally, if I were floating him with others, in a design where their legs could tangle I might be more concern.
I have trucked my horse a few times on multiple day journeys, and the company I don't think would allow float boots. Certainly they're not recommended. I've never had an issue.