Bonner bandages can only be kept on for 20 minutes at the most, don't know about cool boots but the effect with BBs seems to last at least two hours or did when I used one many years ago. I liked the BBs a lot, they did a fantastic job on a very bad racing tendon injury but I was lucky as I was on the yard all day so could use them when I wanted.
I'd still have one now except that someone on here called Tophorse borrowed it and has never returned it, so stole it in other words and as you can tell I'm still not happy about it, sorry to digress.
Can't remember all the bumpf but something about overheating if left any longer which is not what you want, you want the restriction which is the effect you get for the 20 minutes which continues deeper down after you've taken them off. I'm sure someone can explain it better than me. Have to admit though, I don't think there were any cool boots about then so I had nothing to compare it with other than bags of peas which were a right faff, the BB was a much better option, both for results and ease of use.