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Technical Features

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 14ºF means a man should be comfortable down to air temperatures of 14ºF. The same bag will also have a Comfort limit, in the realm of 27°F, so a woman would be comfortable down to an air temperature of 27ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

 

2 thoughts on “Sleeping Bag Temperature Ratings Explained

  1. avatar Baz says:

    G’Day Mike -

    Thanks for your interest in learning more about our sleeping bags! I do have a table available at your request, please email marketing@seatosummit.com for more information.

  2. avatar Mike Prince says:

    Hi,

    Can you please send me a table that shows the temperature rating of all your down sleeping bags. Preferably a table with all the specification/ performance details of the sleeping bags would be appreciated.

    Thanks

    Mike (Prince)

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