a protective structure is disclosed which provides a compound cushioning effect to impact - loading from an external source . the structure comprises a plurality of cells formed between two layers of plastic film material . the cells contain a sealed - in pneumatic substance which substantially surrounds a core of low density , plastic foam material . vents may be provided through the layers &# 39 ; intermediate adjacent cells to provide for the flow of air . a cover of fabric material may be provided over the layers of plastic film material depending on the desired use of the structure .