Feathered Friends’s own description.
Our latest generation: Our Lark 10 UL gets all-new Pertex® Quantum Pro® shell fabric + Pertex® Diamond Fuse lining fabric in the footbox, plus new and familiar colors We made a favorite even warmer. The Lark is a rock-solid three-season sleeping bag built for comfort and performance when the nights turn cold.
Main models on the same shelf, compared with the Lark UL 10 Sleeping Bag on the makers’ published figures.
Western Mountaineering
Bison GWS
rated 50°F warmer
Western Mountaineering
Puma MF
rated 35°F warmer
Sea to Summit
Alpine Down Sleeping Bag
rated 30°F warmer
Not ranked: 24 with no published temperature rating.
See all 11 →Sleeping bags rated 15 to 25°F ranked by maker-published weight: 21 models. Lightest: Therm-a-Rest Vesper 20°F/-6°C Down Quilt at 1.21 lb (550 g).
Sleeping bags and quilts rated 26 to 35°F ranked by maker-published weight: 16 models. Lightest: Zpacks Solo Quilt at 11.8 oz (335 g). Median 1.39 lb.
How to read a temperature rating, why fill weight matters more than fill power, per-size prices, and what the makers publish for the Kelty Cosmic 20, the Western Mountaineering line, NEMO, Sea to Summit, Mountain Hardwear and Therm-a-Rest.