Arc’teryx Alpha IS Jacket

Best for winter sieges
Alpha IS
Price $899.00


Weight 1 lb, 6 oz


Our take 

Don’t choke on your Clif Bar: The $900 Alpha IS jacket justifies its price with an unusual blend of warmth, durability, and waterproofing. A two-layer Gore-Tex shell made with 40-denier, nylon face fabric provides blizzard-proof protection and bushwhack-proof construction, while 92 grams of synthetic insulation add an ideal layer of warmth­—enough to keep you toasty without swamping out when you work hard. Our Alaska testers never overheated during ice climbs in 30°F temps, even without pit zips. However, the non-stretchy shell material doesn’t grant a huge range of motion.

The details 

Wrist gaiters slip easily under glove cuffs, and the side pockets sit high above a harness. Small hood toggles are tricky to grasp, but a big release button loosens easily.

Trail cred 

“When a snowstorm rolled in during a ski tour in Norway, I stayed dry inside and out while wearing this jacket­, since my sweat had fewer layers to push through,” one tester says.

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