Trotter's Gear is a term used to describe the HARNESS and other equipment used by trotting horses. The HARNESS is a type of horse tack that is used to control and guide the horse, and it consists of straps and buckles that attach to the horse's head and body. The other equipment includes a bridle, reins, and a saddle. All of these items are necessary for the horse to be able to perform its job as a trotter.