Ultralight Features. Ultralight Price Tag.Built with SierraLoft synthetic insulation and a lightweight material typically reserved for a higher price point, the Women's Synthesis 20 Degree Sleeping Bag packs light but hits heavy with its feature set. A dual zipper system makes getting in and out a breeze and gives you room to move about, while the self sealing foot vent lets you vent heat with ease.FeaturesSynthetic insulation provides lofty warmth, even when wetDual zipper system for ease of usePatented self-sealing foot vents for fast and easy ventilationDraft dodger collar helps prevent drafts20D nylon fabric for lightweight versatilityMaterialsInsulation: SyntheticShell Fabric: 20d Nylon ripstopLiner Fabric: 20d Nylon TaffetaTechnical SpecificationsISO Limit Temp Rating: 9° F / -13° CISO Comfort Temp Rating: 20° F / -7° CFill Weight: 36 oz / 1.021 kgWeight: 3 lb 12 oz / 1.71 kgFits Up To: 5' 8" / 173 cmLength: 73" / 185.42 cmShoulder Circumference: 59" / 149.86 cmHip Circumference: 58" / 147.32 cmFootbox Circumference: 40" / 101.6 cmStuff Sack Size (L x W): 16 x 8.5" / 40.64 x 21.59 cmSource: Imported Sierra Designs Women's Synthesis 20 Degree Sleeping Bag - Regular