Shoulder pad of shoulder strap

Abstract

A shoulder pad comprises a casing impermeable to air, and one or more breathable bodies of a polymer foam. The casing is fastened at two ends with a shoulder strap and is used to encase airtightly the breathable bodies in such a way that the breathable bodies can be inflated or deflated by an air valve fastened to the casing.

What is claimed is:  
     
         1 . A shoulder pad of the shoulder strap, said shoulder pad comprising an unbreathable unit fastened at two ends thereof with the shoulder strap, and a breathable unit encased airtightly by said unbreathable unit in such a way that said breathable unit can be inflated or deflated by an air valve attached to said unbreathable unit; wherein said breathable unit is formed of a polymer foam body.  
     
     
         2 . The shoulder pad as defined in  claim 1 , wherein said breathable unit is formed of a plurality of polymer foam bodies whereby said polymer foam bodies are airtightly encased by said unbreathable unit in such a manner that said polymer foam bodies are arranged at interval, thereby resulting in formation of 2 plurality of inflatable and deflatable cells, with said cells being alternately arranged with said polymer foam bodies.