SKU: OC2629V Down Treatment: Standard Fill Power: 850 Fill Weight: 1050g (based on size Regular) Insulation Type: Down Weighs: 1670g (Regular) Comfort Limit: -32°C Zip Length: Full Length Zip Position: Left Zip Type: Mummy The Puma Gore Infinium sleeping bags have a Gore-Tex Infinium shell because this makes them more wind and water resistant and so you are less likely to get cold and the down inside the sleeping bag wet - which would be a… Puma Gore Infinium Sleeping Bag