Hey-Sign Eames Plastic Armchair seat cushion Felt cushion for Eames Plastic Armchair. Hey-Sign makes beautiful 100% felt quality products such as coasters, carpets and various accessories. The seat cushion for the Eames Plastic Armchair adds extra comfort to this design chair. Thanks to the large amount of colors, there is always a version that fit your interior. The seat cushion is available with a single layer of felt, a double layer or a double layer with foam in between. Note that this increases the seat height slightly.