Compare a forecast low with a documented bag comfort figure and pad R-value. This is a screening aid, not a safety or survival prediction.
Enter the sleep setup
What the warning means
ISO comfort and lower-limit figures are different, and children’s or specialty bags may fall outside the adult method. ASTM F3340 measures pad resistance in a lab. The broad R-value bands used here follow REI buying guidance; they do not certify suitability for a given night.
Sources and further reading
Source pages and product listings can change. Specifications were assembled from the supplied dataset as of October 30, 2026; current availability is not guaranteed.
See an error? Send a correction