My horse is in bell boots always now that he has shoes. For legs I usually use polos or some version of climatex wraps and saratogas, or nothing. Depends what I’m doing, depends how hot it is. If we’re doing something new that might be cause for legs to go flailing (he’s 4 and short coupled), I’ll put something on his legs.
I used to event, so I do have a ton of sets of boots, I have a set of plain (old) woof boots that go on for hacking, a set of veredus boots (open front and ankle boots) that’ll get some use soon enough, and DSBs that get used once in a while.
That said, I really like the Veredus boots I have for jumping, so I did look at their dressage boots, which at least sound pretty cool, but they’re just so expensive, I couldn’t justify yet another set of boots for a horse that doesn’t interfere/knock himself other than baby moments.