Built with synthetic insulation and lightweight material typically reserved for a higher price point, the Synthesis 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.KEY 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 versatilityREGULAREN Limit Temp Rating: 25F / -4CEN Comfort Temp Rating: 35F / 1CFill Weight: 23oz / 662gMinimum Weight: 2lb 4oz / 1021gFits Up To: 6' 0" / 183 cmLength: 76in / 193 cmShoulder Circumference: 62" / 152 cmHip Circumference: 56" / 142 cmFootbox Circumference: 40" / 102 cmMesh Stoarge Bag Size (LxW): 20 x 12" / 51 x 31 cmStuff Sack Size (L x W): 15 x 7.5" / 38 x 19cm LONGEN Limit Temp Rating: 25F / -4CEN Comfort Temp Rating: 35F / 1CFill Weight: 25oz / 720gMinimum Weight: 2lbs 6oz / 1080gFits Up To: 6' 6" / 198 cmLength: 82in / 208 cmShoulder Circumference: 64" / 163 cmHip Circumference: 58" / 147 cmFootbox Circumference: 42" / 107 cmMesh Stoarge Bag Size (LxW): 20 x 12" / 51 x 31 cmStuff Sack Size (L x W): 15 x 7.5" / 38 x 19cm