The top of the blankets is made from 100% polyester microfiber, while the filling is a blend of 50% TENCEL (Lyocell) and 50% polyester. Depending on the prevailing conditions, TENCEL absorbs moisture particularly quickly and releases it again quickly into the environment. Compared to other filling materials for duvets, TENCEL has the highest moisture absorption. The underside of our blankets consists of the actual functional material: 100% polyester with an Outlast functional coating. The special coating is NASA-certified and tested in space.