Mountaineers and trekkers alike revel in comfort when the Neutrino 400 Sleeping Bag is our blanket for the night. Rab designed it with a high-loft down that delivers a whopping wall of heat when the chill tries to bite its way in. And to prevent any cold penetration, the Neutrino is built with chevron-shaped and trapezoid box-wall baffle construction. Plus, a tapered mummy design and angled footbox design let us slip into a more natural position, ensuring we're comfortable at all hours of the night.Low-bulk sleeping bag for soft and lofty warmth in the mountains400 grams of 800-fill down for blazing heat on chilly hike nightsPertex Quantum fabric ensures a lightweight and a high durabilityChevron shaped and trapezoid box-wall baffles eliminate cold spotsClose-fitting neck baffle is adjustable to maximize heat retentionAngled footbox gives a more natural and relaxed sleeping positionZippered internal stash pocket safely secures your phone at nightIncludes waterproof roll-top storage sack for protected organizationResponsible CollectionRecycled/RepurposedMaterialPertex Quantum (100% recycled nylon), Nikwax finishInsulation800-fill downShapetapered mummyZipper3/4-lengthMax User Height[regular] 74.8in, [regular wide] 66.9in, [long, long wide] 78.8inShoulder Circumference[regular] 27.5in, [regular wide, long] 26.8in, [long wide] 28.3inHip Circumference[regular] 20.5in, [regular wide, long] 21.3in, [long wide] 22inFoot Circumference[regular, regular wide] 16in, [long, long wide] 16.5inBag Length[regular] 86.5in, [regular wide] 78.8in, [long] 90.5in, [long wide] 90.5inDraft TubeyesPockets1 internal zippered stashPad RetainernoneFill Weight400gDegree20FEuropean Norm/ISO Lower Limit Rating20FStuff Sackwaterproof roll-topStuff Size13.8 x 9.1inClaimed Weight[regular] 1lb 11oz, [regular wide] 1lb 12oz, [long] 1lb 13oz, [long wide] 1lb 16ozActivitybackpacking, weekend campingManufacturer Warrantylifetime