Many jockey boots are self-insulated and waterproof. They are designed with flexibility and a multi-tread for excellent traction. Lightweight and knee-length is the general description that a jockey is looking for.
During a horse race in which appearance is factored in (which happens often!) you will want your jockey boots to shine without a particle of dust! Make sure to buff and shine your best pair of jockey boots a few hours before the big race.