Equestrian tack, which is also called horse tack, is any equipment and accessories that is worn by a horse that is domesticated. Saddles, bridles, bits, stirrups, halters, driving harness, reins, martingales and breastplates are equestrian tacks. Equestrian tacks are found or bought in a saddlery, which carries supplies for riders and horses. The words tacking up refer to equipping of horse with tack, such as grooming and putting on the riding equipment.