Herm Sprenger System-4 StirrupsWe love these Herm Sprenger System 4 Stirrups because the irons have 4 joints to help with shock absorption. This unique design absorbs all the shock and trauma from your joints and lower back. A must for those more seasoned riders. The flex ensures that your foot has a quick release if hung while providing the maximum support for your joints. Pivots in 4 directions simultaneously Reduced risk of foot entrapment Softens the impact on cartilage and