The present invention provides a shock absorbing structure made of a rubber-like elastic material having a hardness in the range of 5 to 60, according to a JIS-A type hardness meter and being composed of a base and a plurality of ridges or projections spaced apart in parallel on said base. The shock...http://www.google.co.uk/patents/US5331750?utm_source=gb-gplus-sharePatent US5331750 - Shock absorbing structure
