Dual Foam Design: The upper layer of the thick cushion is filled with memory foam, and the lower layer is filled with sponge, which ensures better support while playing a good comfortable role. 2.3 inch foam exercise bike seat cushion keeps your tailbone comfy, no matter how long your workout lasts. Perfect Size: The rower seat pad measures 15.7x10x2.3 inches, this seat cushion is perfect to be used as your indoor recumbent bike seat cushion, let you can work out longer on your recumbent bike.