Vireo UL

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The Vireo was designed with a single purpose in mind; fast and light alpine climbs where every gram counts. With no hood, no zipper and a variable fill (the lower half is rated at 25ºF / -4ºC, the upper half 45ºF / 7ºC) the Vireo shaves every last ounce. Designed to primarily be used with our down jackets for maximum efficiency. The Vireo UL is the lightest sleeping bag we make.

Best Uses: Ultralight Backpacking, Alpinism, Emergency Bivy

Availability: Select color & length for availability

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  • No zipper to conserve weight and bulk
  • Drawcord on open end to cinch off apertures
  • Designed to be worn with a down jacket for upper-body warmth
  • Differential fills - lower half is filled to 25ºF while the top half is filled to 45ºF
  • Stuff sack and cotton storage bag included


Dimensions 64" / 48" / 38"
Sleeping Bag Shell Fabric Pertex® Endurance UL
Lining Fabric Flite 15 denier ripstop nylon
Fill Power 900+ Goose Down
Fill Weight 62" 8.0 oz / 227 g
68" 8.7 oz / 247 g
74" 9.4 oz / 267 g
Average Weight 62" 14.4 oz / 408 g
68" 15.5 oz / 441 g
74" 16.7 oz / 474 g
Packed Size 7" x 10"
Country of Origin Manufactured in the USA from imported materials

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