Developed from the horse's back up, the Comfort-Fit SMx Air Ride Saddle Pad is contoured to follow the curve of the horse's spine. As a result, the pad locks in place on the horses back, allowing full movement. The SMx 1/2" Air Ride core absorbs shock and improves saddle fit for ultimate equine comfort. 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 horse's body temperature and slows the rate of fatigue. Fleece lining.