An air-holding protective foam pad construction where open cell foam is enveloped in an air-holding cavity formed by top and bottom air-holding sheets. The foam is not attached to the top and bottom air-holding sheets and the sheets are totally and continuously sealed together around a narrow common...http://www.google.com.au/patents/US6519780?utm_source=gb-gplus-sharePatent US6519780 - Air-holding protective foam pad construction
