Synthetic sleeping bags are ideal for damp conditions where down may not perform as well. The Women’s Shut Eye has a -5C Comfort Limit which is impressive for a bag of this weight and pack size. Sierra Designs saysWhether you’re road-tripping, camping, or backpacking you wont lose a wink of sleep with the Shut Eye. With an anti-snag zipper getting in and out of this bag is a breeze. This all-purpose synthetic bag delivers warmth even in cool, damp conditions with a PFC-free DWR treated 20D Polyester shell and an adjustable hood.Our VerdictSierra Design’s Womens Shut Eye 20 Synthetic Sleeping Bag uses 1021g of SierraLoft Synthetic Insulation to deliver a -5C Comfort Limit in a bag weighing 1362g. For a synthetic bag that is a good balance of weight and temperature which is made even more impressive at such a low price. Obviously, you can get a down bag at this temperature rating for a lot less weight and a much smaller pack size but the price will be much higher.The main benefit of using synthetic insulation in bags is it’s ability to retain warmth and keep you insulated when moisture is involved. These bags are ideal for damp conditions such as use with a tarp or bivy, especially when you are doing multiple nights like that. The bag uses a durable 20D material for both the inner lining and outer shell and it has all the usual features you’d expect on a mummy shaped bag, with a good length zip opening, anti-snag zipper, cinchable hood, and the addition of a hand pocket so you can wrap up in it like a blanket.- Reviewed by Ultralight Outdoor GearFeatures20D polyester ripstop shell, 20D polyester taffeta liner makes for a durable exterior and a soft as butter interior.Adjustable hood cinch for additional protection when the temps dropAnti-snag zipper for easy useHand pocket to use bag like a blanket for bed-like comfortISO TestedStuff sack included for easy pack up and transportSpecificationsTemperature RatingTemperature Rating: 20F / -6.67CISO Comfort Temp Rating: 34F / 1.11CISO Limit Temp Rating: 23F / -5CRegular SpecsWeight: 1362g (excludes storage bags)Fill Weight: 36 oz / 1020.58 gFits Up To: 68 in / 172 cmLength: 74 in / 188 cmShoulder Circumference: 59 in / 150 cmHip Circumference: 58 in / 147 cmFootbox Circumference: 40 in / 102 cmStuff Sack Size (L x W): 9 x 15 in / 23 x 38cmMaterialsInsulation: SierraLoft SyntheticShell Fabric: 20D PolyesterLiner Fabric: 20D Polyester TaffetaHelp and advice:Womens Sleeping Bags How do they differ?The Ultimate Guide to Lightweight Sleeping BagsTime-Saver Guide to Choosing a Sleeping BagThe EN13537 StandardAll About DownResponsible Down StandardHydrophobic Down

Synthetic sleeping bags are ideal for damp conditions where down may not perform as well. The Women’s Shut Eye has a -5C Comfort Limit which is impressive for a bag of this weight and pack size. Sierra Designs says