A helmet with an inflatable cells or pockets formed from layered high and low density materials

摘要

On the inner side of an outer shell is at least one inflatable element connected with inflation means. The element has cells of pockets for pressurisation or pressure-release. The cells contain a high density impact-absorbing foam layer of 200-300kg/m2, and a relatively low density material foam layer of 20-50kg/m2.