think of it this way. Your goal is to slide on a hard wood floor. Would you rather try to slide in socks or in sneakers with really good treads? You'd want the socks because they create less friction. Think of regular horse shoes as the sneakers. The sliding plates are the socks. It makes it easier for the horse to slide, since only the back feet are "on" the ground when he slides. The front feet propel him foward, but never actually slide. To get a horse to slide, you accelerate down the length of the arena until you are at a full gallop. You then ask the horse to stop. No horse can stop dead from a full gallop, so reining horses and roping horses slide in order to slow themselves down. Rope horses do it to propel the roper towards the calf and create the "calf jerk". Reining horses do it in the same principle, but it's all for show. The wider the plate, the less friction. So, the the wider the plate/fuzzier the sock, the easier it is to slide. "Sliders" have their disadvantages. They include...
-less traction on surfaces (pavement, cemement, mud, dirt, grass)
-increased risk of slipping on hills and loose footing
-Less traction to escape any danger
-harder to propel hind end foward
-more stress on the hocks (the elbow joint of the back leg)
-more expensive
-last a lot less time than most shoes
-Come off easily
-Can be damaged simply by stepping on a stone
The advantages include...
-increased sliding distance (anywhere from 10-40 ft)
-Less heat in ankles and hooves
-less stress on navicular bone (deadliest bone in the horse's body)
-less stress on canon bone (similar to our radius in the arm)
-Less stress on hip
-Easier to draw legs under the body
-Easy to make and put on
-Can be made to have removable studs
I am going to look at some patterns. Right now I have to look up leg injuries since Boo appears to have one. The vert thinks it's an absess, but he hasn't examined her yet. Will let you know as soon as I hear the news.