Mountain Equipment’s Womens Helium 600 sleeping bag is from their ‘Womens Helium’ series of bags which hit a sweetspot for trekking and backpacking, very technical with high warmth to weight ratios they are many hikers ‘goto’ bag.Mountain Equipment says:Low in weight and and pack size this is a bag that’s warm enough for early Spring and late Autumn use at higher altitudes or Northern latitudes.Our VerdictMountain Equipment’s Womens Helium 600 Down Sleeping Bag Down Sleeping Bag is part of their Women’s Helium range which are highly technical, accomplished sleeping bags for backpacking and trekking. They use 700 Fill Power down and a new baffle construction technique to achieve some excellent warmth to weight ratio figures. 948grams for a -11C bag is a great ratio.Design wise Mountain Equipment’s sleeping bags are superb, the hood and footboxes are particularly well designed with multiple baffle sections to give them shape and structure. The Helium bags have a built in neck collar rather than an out and out shoulder baffle – this saves weight and is pretty good in use.The women’s bags differ from the men’s in that they are fitted for a shorter person and have smaller footboxes reflecting the physical differences generally speaking between men and women. The smaller womens footbox will feel warmer than the mens because it has the same amount of down in smaller chambers.There’s a DWR coating on the outer shell which is PFC free, this will give the bag some resilience to a damp environment. As an ultralight backpacker I think these bags are a superb choice like buying IBM, back in the day.- Reviewed by Ultralight Outdoor GearFeaturesWomen’s Alpine fit with zoned EXL system maximises thermal efficiencySlanted box-wall baffles throughoutMid-level side seams5 baffle anatomically shaped hood4 baffle anatomically shaped and offset foot-boxFull length Gemini zip baffle with 140cm zip and integrated neck collar with Lode Lock closureSupplied with waterproof roll-top stuff-sack and storage cubeSpecificationsRegular weighs: 948g (excludes storage bags)Long weighs: 999g (excludes storage bags)Packed size: 23 x 22 x 22cmTemperature RatingsComfort: -5C / 23FComfort Limit: -11C / 12FExtreme: -31C / -24FGood Nights Sleep Guaranteed*: -8C / 18F*Mountain Equipment use their own ‘Good Nights Sleep Guaranteed’ rating which they believe is a more accurate number for some sleeping bags and is based not just on the EN test results but on lab testing, their own use, thermal imaging and cold chamber work, along with a lot of data analysis.Material & Construction100% recycled HELIUM 20D outer shell is very light and highly breathable with PFC free DWR547g of 90-10 Pure European Duck Down with a minimum fill power of 700100% recycled Supersoft 20D lining fabric with PFC free DWR100% Polyamide outer/inner, Down fillHelp & advice:Womens Sleeping Bags How do they differ?The Ultimate Guide to Lightweight Sleeping BagsTime-Saver Guide to Choosing a Sleeping BagThe EN13537 StandardMountain Equipment Sleeping Bag GuideDown QualityAll About DownHydrophobic Down

Mountain Equipment’s Womens Helium 600 sleeping bag is from their ‘Womens Helium’ series of bags which hit a sweetspot for trekking and backpacking, very technical with high warmth to weight ratios they are