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This versatile mid-weight baselayer ensures comfort in cool weather.

Despite being the middle "child" of Arc'teryx baselayers, the Women's Long-Sleeve Phase AR Zip-Neck Top deserves respect. This mid-weight baselayer fits like a second skin, so you can pile on the layers or wear it alone for a sleek, aerodynamic profile. The combination of mid- and light-weight technical fabrics creates an efficient system to keep you warm and still provide escape routes for excess heat and sweat. Underarm gussets mean you can do the wave at football games or stretch for a tricky hold and not rip your shirt. Flatlock stitching reduces the likelihood of the seam-induced chafing. The Phase AR Zip-Neck might be the perfect top for your fall backpacking trip: wear it alone during the day as you're hiking towards camp, throw on a fleece while you're setting up the tent, and then add a shell when darkness falls and daytime heat seems imagined.

  • Phasic AR body, Phasic SL underarms
  • Encapsulated silver ions
  • Flatlock seams, gusseted underarms
  • Half-length neck zipper
  • UPF 50+

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Arc'teryx Phase AR Zip-Neck Top - Women's

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Here's what others have to say...

4 5

Nice articulated arm.

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Height: 5' 5"
    Weight: 120 lbs
    Size Purchased: s

The fabric under the arm pit is different than the rest. Gives it more breathability during activities. Comparing to other Arcteryx base layers, the Phase AR is not very smooth on the skin.
I also have the Phase SL, which is lighter in weight and super smoother on the skin.
I have the Rho LT, which is a little bit heavier weight than the Phase, but Rho is much softer with a thinner fleece lining on the inside.

Unanswered Question

What is the length? Looking for longer baselayer since I am tall. Thanks!

5 5

Give Jack Frost "the bird"

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I have been a fan of Arc'teryx for years. I own an older version of the AR zip top -- in florescent yellow. I felt it was time to upgrade as well as buy one that wouldn't blind my fellow BC skiers. I chose the Phase AR in the subtle, goes-with-anything, Black.

True to my older model, this baselayer performs to its word. I typically wear a lightweight wool layer under it and a micro-down jacket over the top, with my Arc'teryx shell as the finishing piece. The Phase AR fabric wicks sweat away from my skin which keeps me dry, and I'm sure you know that in the winter cold, dry means warm.

It's lightweight and the fit was spot on. Additionally, after 8 hours of skinning, I didn't stink. I usually reserve that phrase for merino wool. Needless to say, I'm impressed.

5 5

Love it!!

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I love the way this baselayer fits. It is comfortable and tight-fitting, and moves with my body so it feels like I'm not wearing it. Like everything Arc'teryx makes, it's worth the money!