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Blizzard Survival
Warmth-To-Weight Ratio

It is established practice to express the thermal efficiency of sleeping bag materials as a warmth-to-weight ratio by dividing the insulating value of the material (in Togs), by the weight of a typical sleeping bag made from the material (in kilograms). The table shows typical values for synthetic and down sleeping bags (as ascertained by Leeds University), and for a Reflexcell™ sleeping bag.

Using a tog rating of 8 Togs and a weight of 330 grams for the Reflexcell™ bag gives a value of 24 Togs/kg. This is well over twice the value for goose down, which was previously regarded as having the highest possible warmth-to-weight ratio among usable insulating materials. It is worth noting that the warmth-to-weight ratio of goose down is drastically reduced by the presence of moisture, whereas that of Reflexcell™ is hardly affected.

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Blizzard Survival

Blizzard Protection Systems Ltd.
Head Office,
Unit 2, Coed y Parc Industrial Estate
Bethesda, Gwynedd
LL57 4YY, UK

Tel: +44 (0) 1248 600666
Fax: +44 (0) 1248 600444


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