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A four-season sleeping bag that's light and packable for your overnight ski-touring needs.

Rest peacefully in the Therm-a-Rest Altair 0 Degree Down Sleeping Bag while you listen to the soothing sound of snow blanketing your four-season tent. Designed to keep a gal comfortable in 26F or a guy warm in 14F (according to EN comfort ratings), the Altair is just the bag to pull from your pack after a full day of ski touring or mountaineering. Plus, it's Synergy Connectors bring your sleeping bag and mat together for uninterrupted sleep.

  • EN rating is 14F for the lower limit (an average man’s comfort level) and 26F for the comfort range (average woman’s comfort level) for cold nights in the backcountry during your mountaineering or backcountry ski expeditions
  • EN ratings are developed from procedures and testing conducted by independent organizations in the US and Europe
  • Lightweight, compressible 750+ fill goose down insulation provides optimal warmth
  • Zoned Insulation features three-dimensional baffled insulation on the top, sewn-through down insulation on the sides, and a fabric-only bottom designed to partner with your sleeping pad, which provides insulation beneath you
  • Mummy-shaped bag decreases cold spots, weight, and packed size
  • Efficient Comfort fit design has extra room in the torso to allow your shoulders, elbows, and hips to move freely while a closer fit around the head and feet keeps you warm
  • A 30D ripstop nylon shell offers lightweight performance while a DWR coating supplies protection against the morning frost
  • Sculptured hood, trapezoidal footbox, draft tubes, and collar insulate your body and prevent the cold from seeping in
  • Left-side, snag-free zipper offers an easy in-and-out
  • Synergy Link Connectors consist of two flexible fabric bands that keep your bag centered on your sleeping pad so you won't slip off during the night (connectors fit any sleeping pad up to 25in wide)
  • Internal stash pocket holds your headlamp or beanie
  • Includes storage and stuff sack

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Therm-a-Rest Altair Sleeping Bag: 0 Degree Down

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Here's what others have to say...

Are Therm-a-Rest sleeping bags made in the...

Are Therm-a-Rest sleeping bags made in the USA?

Responded on

Found on another web site saying they are made in China. Dang it!!!

Responded on

Yes their bags are made in China, but Therm-a-Rest manufactures all of their sleeping pads in Seattle, Washington at the Cascade Designs manufacturing facility.

GEAR REVIEW: Thermarest Altair Sleeping

Very promising line of sleeping bags from Thermarest. Check out my video review of the Altair... I was impressed.

5 5

Excellent Sleeping Bag

  • Familiarity: I've used it several times

I purchased this for my fiance to keep her warm while backpacking (I use the Antares). This bag does a great job, it's just like the Antares but with a little down underneath the bag, rather than the zero down the Antares has underneath your body. The stuff sack for this should be smaller, as this bag could easily get into a smaller compression sack. If you want to know a little more about it, check out my review of the Antares. They are the exact same bag, just this one is a zero degree (resulting in a slightly heavier/bulkier bag).

Compressed Bag

Compressed Bag

This picture doesn't quite do it justice. This packs down SMALL, as well as light. It doesn't compact down as small as the Antares, but then again, this is a zero degree bag. I fit this bag (which belongs to my fiance), my BA Q-Core, the Thermarest NeoAir pillow, and my rab generator, and a rain jacket all in the bottom compartment of my Deuter Aircontact pack. Great backpacking setup!

NEW! Therm-a-Rest? 4-Season Sleeping Bag

A true four-season sleeping bag needs to be warm down to 0F (-18C), while still being light and packable enough to make your days in the mountains enjoyable. Therm-a-Rest's four-season series includes the down-filled Altair sleeping bag and the synthetic Centari sleeping bag. Watch our video to learn how Therm-a-Rest sleeping bags let you to sleep better and go farther...