This Classic Equine ESP 3/8" wool blend top that offers shock absorption and protection, and resists compression and matting for a longer life. 1/2" memory foam middle layer is extremely conforming and temperature-sensitive. This pad continuously molds and conforms to the shape of the horse's back then rebounds to its original shape when pressure is removed. 5/8" orthopedic grade felt bottom that soaks up moisture, allowing heat to dissipate away from your horse's back. This felt is washable so sweat and grime can be washed away! Measures 28" x 28".