I don't use anything on my horses- Not once have I had an injury from it. Hell when Pepper was cutting (before me) they never hauled her with boots either and she has been around the block a time or two..
I have always heard that you should not haul in smb, legacy or the like "performance" boots because they trap heat (when I bought my legacy boots there was even a warning about it)..And when I use mine they are put on for my run (say if I am sorting) and then pulled right back off (unless its winter and super cold, then I fell can get away with a bit more time).
What do you guys do about that or do you just not haul that far??