4 layers of fibre glass, 1 layer of kevlar . GY-GH7000:4 layers of fibre glass, 1 layer of kevlar and an additional layer of kevlar on the chin and on the forehead,4 layer of fibre glass. the liner is Absorption Foam.Sizes:S#M#L# GY-GH8000: 1 layer of carbon, 2 layers of fibre glass, 1 layer of kevlar, 2 additional layers of kevlar in the chin and in the forehead , 1 layer of fibre glass, 2 ...