A landing mat for gymnasts is composed of a top layer serving as a primary cushion, a middle layer disposed under the top layer so as to stabilize the posture of the gymnasts going to land on their feet, and a bottom layer serving as a main cushion and secured to a lower surface of the middle layer....http://www.google.co.uk/patents/US5562573?utm_source=gb-gplus-sharePatent US5562573 - Landing mat for gymnasts
