| 摘要 |
Multi-layered material (1) that at least comprises a first layer (2) and a second layer (3) bonded thereto, whereby both layers (2,3) are made from flexible foam and the first layer (2) is made from a foam with a greater permeability to air than the foam of the second layer (3), and whereby the second layer (3) has openings (8) that run across the entire thickness of the second layer (3) in order to enable air exchange between the first layer and the second layer. |
