Designed with yoga or aerobic studios in mind, PlybooFit provides a layer of cushion beneath the Plyboo floor of your choice. Made of 93 perent recycled rubber, the layer reduces leg fatigue for people who stand, jog or pose on the floor. As an added bonus, the subfloor reduces noise between floors. Designed for yoga, but a welcome addition to any residence. You might also be interested in PlybooQuiet which is a slightly thinner rubberized layer.