A cushion pad has an upper layer, a middle layer, and a lower layer. The middle layer is disposed between the lower layer and the upper layer. The upper layer is made of an air-permeability fabric. The middle layer has two mixture layers, and a gauze fabric layer disposed between the mixture layers....http://www.google.ca/patents/US6131221?utm_source=gb-gplus-sharePatent US6131221 - Cushion pad
