KarenC is exactly right in that Tevis does have cut-off times. I had a friend who unfortunately came up against one this year, too bad, but it is all for the safety of horse and rider. The ride transverses some tough trail, made even harder in the dark. You also have to cross the river in the dark, no thanks!
And as for the booted horses, actually the top 4 horses were booted, all riders from EasyCare in Durango. I think they must know tough terrain! I also saw plenty of steel shoes, shoes with pads, plastic shoes, different boots. And my rider finished with 3 steel shoes and an easy boot! It is hard to compare boots and shoes from years ago, as there weren’t good booting options. And now there are many different kinds of steel shoes too. But it is all interesting.
Also interesting and fun to watch was all the different saddles, pads, bridles, bits, clothing, and all the stuff tied onto the saddles. Some people rode with just a waterbottle strapped to their waist. Others with everything but the kitchen sink on their saddle. Some switched saddles as they entered the canyons, to drop weight.
They were also doing a medical study and taking blood of every horse at Robinson Flat (36 miles in). To compare later with horses who may be pulled, need medical attention, etc.
A fascinating race to be at. Still don’t want to ride it, but glad to help!