SKU: SS22891 Weighs: 640g Fill Power: 850 Down Treatment: Standard Comfort Limit: 0°C Insulation Type: Down Zip Position: Left Zip Fill Weight: 340g Type: Mummy The bag uses high-quality down and ultra-light ripstop nylon; these high-quality materials are how the bag can provide such high levels of warmth at such a low weight. Exped says: The Ultra 0°C (32°F) is a feathe… Ultra 0° MW Down Sleeping Bag