Low permeability airbag and method

A with the air penetrability the airbag (2,4). The airbag (2,4) is composed of two independent material layer, the inner layer (6) and penetrability is small, an intensity layer (8) inside inner layer (6), two slot along the sewing thread (12) ring; the inner layer (6) by a membranous material producing, which is better the carbaminate. The external layer (8) is made of the fabric.