Their Astro Pro professional down sleeping bag is perfect for alpinists, both in the tent and under the stars. The inner shell, which can be stretched by 25% in width, fits perfectly around the sleeper. It offers plenty of space and at the same time keeps the warmth in the sleeping bag. The sensitive area of the feet is optimally insulated by the three-dimensional foot box and the ergonomic cut ensures pleasant foot freedom. All models of the Astro Pro series are a bluesign® product and are also made of certified down (RDS).