I had a set of Clarendon boots for my old horse, lovely and smart and fluffy.........until you went throught the water jump and they soaked it all up and went really heavy and probably would have stayed so for hours. Switched to Woof ones, so much easier.
I've had mine for about 10 years, too smart (& expensive at the time)for getting dirty on wet hacks and XC though. Always used them in the jumping phase of workers, showjumping , at home schooling or dry hacking
Really love them, never slipped however fast we were going