High warmth in a low-bulk, low-weight design may seem impossible, but Rab's Neutrino 600 Sleeping Bag surprises us. Designed with year-round alpine missions in mind, this sleeping bag is warm enough for wintry excursions without making us sacrifice space in our packs.Alpine sleeping bag offers year-round warmth at high altitudesRecycled nylon blocks wind, resists punctures, and repels moistureHydrophobic insulation remains warm and lofty in wet conditionsGoose down certified to the Responsible Down StandardBaffle shape reduces weight while maximizing loft and warmthInsulated draft tubes trap heat and prevent cool air from sneaking inResponsible CollectionRecycled/Repurposed, Responsibly SourcedMaterial[face fabric] 20D Pertex Quantum (100% recycled nylon), FC-free DWR coating, [lining] 20D 100% recycled nylonInsulation800-fill goose down (RDS-certified), Nikwax (FC-free hydrophobic coating)Shapetapered mummyZipper3/4-lengthMax User Height[regular] 6ft 0.8in, [long] 6ft 6.7inShoulder Circumference[regular] 63in, [long] 63.8inHip Circumference[regular] 52.8in, [long] 53.5inFoot Circumference[regular] 40.2in, [long] 40.9inBag Length[regular] 84.6in, [long] 90.6inDraft Tubeinternal 3D collar, insulated zipper bafflePockets[internal] 1 stash Pad RetainernoneFill Weight600g (1lb 5.2oz)Degree10FEuropean Norm/ISO Comfort Rating23FEuropean Norm/ISO Lower Limit Rating-26FStorage Sackcotton, zipperedStuff Sackroll-top compression sack includedStuff Size15.7 x 10.2inClaimed Weight[regular] 2lb 3.2oz, [long] 2lb 5.5ozActivitybackpacking, mountaineering, weekend campingManufacturer Warrantylifetime