Kentucky, veredus and premier equine international
Kentucky!!! Extremely important especially when you get to the higher grades. They help lower the chance of your horse seriously injuring his/her legs especially if you wear studs which can cut open tendons and ect...
Veredus is one i use most often, also Les Miex
Roma are really cheap and they've lasted me a long time, easy to look after too - just hose them down after a show