Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Brands

Sleeping Bags

Feathered Friends Vireo

The Vireo is built for climbers. Notably, this down bag has no zipper, is cut narrower and has more insulation about the legs than the chest.

Lock Icon

Unlock this article and more benefits with 40% off.

Already have an Outside Account? Sign in

Outside+ Logo

40% Off Outside+.
$4.99/month $2.99/month*

Get the one subscription to fuel all your adventures.


  • Map your next adventure with our premium GPS apps: Gaia GPS Premium and Trailforks Pro.
  • Read unlimited digital content from 15+ brands, including Outside Magazine, Triathlete, Ski, Trail Runner, and VeloNews.
  • Watch 600+ hours of endurance challenges, cycling and skiing action, and travel documentaries.
  • Learn from the pros with expert-led online courses.
Join Outside+

*Outside memberships are billed annually. Print subscriptions available to U.S. residents only. You may cancel your membership at anytime, but no refunds will be issued for payments already made. Upon cancellation, you will have access to your membership through the end of your paid year. More Details

Feathered Friends
VIREO $220 (Pertex Quantum version) WEIGHT: 17 ounces

The Vireo is built for climbers. Notably, this down bag has no zipper, is cut narrower and has more insulation about the legs than the chest. The wider cut gives you room enough inside to wear a bulky down jacket, extending the bag’s range. The Vario is listed as a 45-degree bag, but I used it 10 nights at freezing and only wore mid-weight Capilene. Another tester took the bag to the Wind Rivers and the Tetons in October, while a third tester used it in a snow cave in Valdez in December. We all slept comfortably. During below-freezing nights, I wore an 11-ounce down parka inside the Vireo, which is available in a variety of shell fabrics to further let you fine-tune it. For tent camping, I recommend the highly breathable but not so weather-resistant .85 nylon ripstop. For bivies and snow caves, where damp conditions persist, go with the Pertex Quantum, Epic or Event.

PROS Great warmth-to-weight ratio, good for temps from 35 to 50 degrees. Feathered Friends, a custom company, offers the Vireo in different shell materials, lengths, fill options and colors.

CONS Lack of a zipper limits the bag’s versatility. No hood. (Feathered Friends does offer an add-on down-jacket hood.)

RECOMMENDED USE Three-season alpine bivies and snow caves; summer camping.