The TUNØ pillow is a 3-chamber pillow, with large and soft goose down in the outer chambers and small feathers in the middle to provide extra support. The spring is made of 50% cotton and 50% lyocell (TENCEL™). TENCEL™ is a brand under Lenzing AG. Lyocell is a natural material, which is used in sportswear, among other things, as it has some fantastic moisture and sweat transporting properties. Lyocell feels like a soft cotton satin.