The vaude ice peak 400 down sleeping bag is designed for the extreme outdoors this technical 3 season sleeping bag has a water resistant polyamide outer and is filled with 9010 grey duck down by using down instead of synthetic filling the ice peak 400 makes the most of a very highly regarded material weight for weight down is much warmer than synthetic filling and also packs down smaller the mummy shape of the ice peak 400 is the classic sleeping bag design this body hugging bag tapers towards