Air cushion for safety helmets and head coverings has closed or open air system with one or more air chambers and is of tubular form with round, oval or polygonal cross-section, can be made of rubber, India rubber or film

摘要

The air cushion has a closed or open air system. It contains one or more air chambers and is of tubular form. The tubular cross-section can be round, oval or polygonal. It can be made of rubber, India rubber or film.