The pillow has a smooth cover with a silky feel. This cover is made of MMC 120 PU, a polyurethane of a bi-elastic fabric. The cover is removable and can be washed separately as the pillow has an inner cover. The siliconised polyester hollow fibre has been developed so that its properties resemble natural down as closely as possible. The wafer-thin channels in our extremely thin fibres enable them to reproduce the insulating effect of down.