The cover is made of 100% cotton and the filling of 100% wool fibres, which are both natural and skin-friendly materials. We use a special wool quality that is lighter than conventional wool fibres. These provide maximum comfort with minimal weight for an unforgettable sleeping experience. Unlike synthetic fibres, wool does not absorb much odour (e.g. perspiration) and has a natural self-cleaning function - absorbed odour is released back into the air, the wool smells neutral again after a short airing. It also wicks away moisture faster than other fillings, for example.