We're braving the rocky terrain above treeline for a few nights, so the first thing we shove in the bottom of our backpacks is the Neutrino Pro 700 Sleeping Bag. Rated for comfort at temps as low as 5F, the 700 uses a close-fitting design and high-fill power down to keep us cozy under the icy mountain air. Pertex Quantum Pro fabric and hydrophobic down give us the confidence those tough elements won't interfere with our shuteye.Warm sleeping bag for braving mountainous nightsPertex Quantum Pro fabric for lightweight weather protectionTapered mummy design reduces heat loss and bulk for packingAdjustable hood seals in the warmth and keeps out gustsNikwax-treated down means it's less susceptible to piling if wetTrapezoidal baffles maximize loft for increased heat retentionMaterialPertex Quantum Pro (20D 100% recycled nylon, PU, fluorocarbon-free DWR) [lining] 20D 100% recycled nylonInsulation800-fill downShapemummyZipper3/4-lengthMax User Height[regular] 72.8in, [long] 78.7inShoulder 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 Tubeadjustable, hood, adjustable neck bafflePockets1 zipperedPad RetainernoFill Weight35.3ozDegree[Rab sleep limit] 5FStorage Sackzippered cottonStuff Sackwaterproof roll-topStuff Size15.7 x 10.2inClaimed Weight[regular] 2lb 8oz, [long] 2lb 11ozActivitybackpacking, mountaineeringManufacturer Warrantylifetime