UKC

With top notch build quality and some clever features, this sleeping bag and mat from US brand Nemo bring something a little different to the table, says Tim Hill.

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The temp. rating/fill weight is a bit weird – 600g of 800FP down should get you well below ISO comfort rating of just -2C. Comparable sleeping bags with 600g of even less lofty 650FP down manage the same comfort temp. rated by EN 13537 or its latest equivalent, which should at least theoretically show the same results (I know, it can still differ for wildly varied bag styles, but here it's still basically a mummy at its core). Is that discrepancy because of lesser quality baffles, the hydrophobic down used being less lofty or what? It's just a technicality, although an interesting one.

Also, as most of the US producers, they name their bags based on the ISO/EN limit temperature, unlike most of the good European ones. Just a point to note, although the article states the comfort temperature and NEMO correctly states it in their tech specs.

Nemo use the true "comfort" temperature rating on their bags not the "comfort limit" or "limit" 

If you look up a comparable bag from Rab (fair bench mark in the UK) with 500g of 800fp down it has a comfort rating of 0°C and a comfort limit of -6°C.

VS the Riff from Nemo with 540g of 800fp down with a comfort rating -2°C and comfort limit of -8°C