Model: Neutrino Endurance 200
Overall Score: 4 / 5
[light and rain-ready]
Why we like it It’s light, compressible, warm, and water-resistant (both the shell and the treated down). Our Pacific Northwest testers were crazy about it.
Warmth-to-weight ratio The Endurance compresses to the size of a football, but has enough 800-fill goose down to keep testers warm in sub-freezing conditions: One mistook it for a 20°F bag (it’s a 32°F) after he took it down to 25°F in Washington’s Enchantments. Rab teamed up with researchers at England’s University of Leeds to determine the ideal ratio of baffle size to down content—a sort of body-mapping. By dialing in each chamber’s precise dimensions and down volume, they used less material, reducing weight while maintaining warmth.
Water-resistance Despite being see-thru thin, the 30-denier, DWR-treated Pertex Endurance shell kept the wet out through a week of packrafting in Alaska’s Gates of the Arctic National Park. Even in deluge conditions with gusts up to 40 mph, the bag never lost any loft, thanks to the water-resistant down from Nikwax.
Fave Features Testers loved the roomy (for an ultralight)dimensions, and its super-smooth-running zippers.
gripe Some testers wished for a bigger draft collar. $305; 1 lb. 8 oz.; 32°F; rabusa.com