Headgear securement system

With the outer layer and corresponding to the flexible of the inner layer of a type of cap it comprises the outer layer is around the inner layer extending from the strip belt and tension device of the tension device can be clamping strip the strip so as to make the inner layer is far away from the outer layer and close to the helmet a wearer the head part of the. Preferably tension device comprises releasably fixed to the helmet the front part of the binding belt the lower jaw assembly.