Comparison, not guarantee

How strong is the warmth evidence?

Use the actual comfort and lower-limit results, not the rounded number in a bag name. Then put the pad and a forecast buffer back into the conversation.

Trip-plan result

Ratings compare sleep systems, not sleepers

Bring the forecast, the tested bag rating, your pad, and a buffer you can live with.

Cold sleepers use the colder-sleeper number

The ISO/EN comfort rating and lower-limit rating describe different reference sleepers. If you do not know which one resembles you, the comfort rating is the more conservative comparison.

Current explanation: REI on ISO/EN comfort and lower-limit ratings. Pad comparison standard: ASTM F3340.