A seat cushion comprising a resilient wedge-shaped pad having an upper surface at an incline sloping downwardly from a higher end to a lower end. A plurality of spaced apart gel packs are on the upper surface of the resilient wedge-shaped pad. The gel packs closest to the higher end are of a high density,...http://www.google.com.au/patents/US6009578?utm_source=gb-gplus-sharePatent US6009578 - Seat cushion
