Almost all shows prohibit martingales in "flat" or "under saddle" (not to jump) classes. Martingales are only permitted in over-fence classes, and only the standing martingale is legal in hunter classes. A running martingale is legal for jumpers, but it is not for hunters. According to the 2007 USEF Rule Book for the Hunter division, "Martingales of any type are prohibited in Under Saddle, hack and tie-breaking classes. Standing martingales are allowed for all over fence classes. All other martingales may be considered unconventional."