SKU: SS23158 Weighs: 1035g (Regular) Comfort Limit: -7°C Insulation Type: Down Fill Weight: 539g Fill Power: 600 Down Treatment: Hydrophobic Zip Position: Left Zip Type: Mummy A warm and cosy down bag the reduces cold spots and drafts from entering the bag. 625g of Down Tek™ and a fill power of 650 gives Greystone 20 comfort limit of -7°.   Big Agnes says:  Our Greystone 20… Greystone 20 Down Sleeping Bag