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Good winter sleeping bad
Reviewed By Alex, 23 Dec 2013

A great bag which I use for winter mountaineering trips. It lofts well + delivers excellent warmth, especially with the well positioned cords for tightening the hood + neck baffles. The cords are elasticated allowing greater comfort than non elastic for when you're moving around etc. I've not had the zip jam yet either, something that I've struggled with in the past with other bags.
Being down it packs much smaller than an equivalent warmth synthetic bag and uses a great waterproof stuff sack provided. There is a second stuff sack to use when storing the bag allowing it to maintain it's loft.
The endurance coating is splash proof so useful if you're setting up in snow/rain or spill something but beware this is a double-edged sword. Everyone sweats at night, regardless of their temperature, and the coating does reduce the ability of the water vapor to leave the bag so if it's used in an area with little ventilation (as I do, in a bivvy bag) there will be moisture within the bag in the morning. It's not a problem and in my case I'd rather have the relatively small amount of moisture from this than the drips of condensation falling on the bag from the inside of the bivvy bag (when it's raining/snowing outside the breath-ability of the bivvy bag is also reduced). However, if you're after a bag to be used in a tent or environment where there won't be any risk of it getting wet I wouldn't have the endurance coating. Be aware down looses most/all of it's thermal properties if it gets saturated. If you want a bag for a very wet environment I'd think about synethetic - but it will be a bigger beast to pack!
Overall the neutrino 600 is the best bag I've ever used and I expect it to last for years - the build quality is outstanding. Rab are renowned for their down products which is why I went for this bag over others, it's outstanding