Apex 100% steam pressed performance wool and the highest grade felt available to provide pure comfort against the horse. The fibers in our orthopedic foam are smaller in diameter which means more durability with a consistency that resembles the luxurious softness of cashmere. Inside the pads saddle tree bar area from front to back is Nitro-Gel for additional maximum shock protection. Nitro-Gel wont ever break down, pop, or freeze!