SMx H.D. (Heavy-Duty) Air Ride Saddle Pads have a 3/4 inch breathable core and hand woven 100% wool Navajo blanket top. Heavy-Duty SMx Air Ride core protects the horse's back from pressure. The Air Ride core is made of a unique material found in the protective gear of professional human athletes for absorbing shock while allowing air flow to the skin, creating a natural cooling system that lowers the horses body temperature and slows the rate of fatigue. The soft merino wool lining wicks away moisture.