SKU: SS21644V Insulation Type: Synthetic Weighs: 1266g (Regular) Comfort Limit: -5°C Zip Length: 3/4 Length Zip Position: Left Zip Type: Mummy Synthetic sleeping bags are ideal for damp conditions where down may not perform as well. The Shut Eye has a -5°C Comfort Limit which is impressive for a bag of this weight and pack size. Sierra Designs says Whether… Shut Eye 20 Synthetic Sleeping Bag