Even during the summer, the temperatures can get drastic after dark, so we keep the Neutrino Pro 500 Sleeping Bag in our mountaineering kit for three-season comfort. The bag's narrow silhouette and chevron-shaped baffles keep pack weight as low as possible, while 800-fill down ensures we're as warm as can be once the sun goes down. Weather-resistant hydrophobic down and water-repelling recycled nylon prepare us for summer storms and high-mountain snow.Narrow mummy sleeping bag offers cozy nights at high elevationsFifteen-degree limit ideal for three-season alpine adventures800-fill power down with Nikwax treatment for all-weather warmthInsulation certified to the Responsible Down StandardRecycled Pertex Quantum Pro is abrasion- and moisture-resistantChevron-shaped baffles cut weight and improve heat retentionClose-fitting neck baffle and adjustable hood prevent draftsIncluded waterproof compression sack saves pack space and weather worriesResponsible CollectionRecycled/Repurposed, Responsibly SourcedMaterialPertex Quantum Pro (20D 100% recycled nylon, PU, fluorocarbon-free DWR), [lining] 100% recycled nylonInsulation800-fill down (RDS-certified), Nikwax fluorocarbon-free hydrophobic finishShapetapered 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 TubeyesPockets1 zipperedPad RetainernoneFill Weight500g (1lb 1.6oz)Degree[Rab sleep limit] 15FEuropean Norm/ISO Comfort Rating32FEuropean Norm/ISO Lower Limit Rating-11FStorage Sackzippered cottonStuff Sackwaterproof roll-topStuff Size13.8 x 9.1inClaimed Weight[regular] 2lb 0.3oz, [long] 2lb 2.5ozActivitybackpacking, mountaineeringManufacturer Warrantylifetime