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  • Arc'teryx - Phase AR Zip-Neck Top - Women's - Black
  • Arc'teryx - Phase AR Zip-Neck Top - Women's - Poseidon

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  • Arc'teryx - Phase AR Zip-Neck Top - Women's - Black
  • Arc'teryx - Phase AR Zip-Neck Top - Women's - Poseidon

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

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    5 Reviews


    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+
    • Item #ARC3622

    Tech Specs

    [body] Phasic AR (87% polyester, 13% polypropylene), [underarms] Phasic SL (70% polyester, 30% polypropylene)
    UPF Rating
    [body] 50+, [underarms] 25+
    Claimed Weight
    (medium) 5 oz
    Recommended Use
    layering, running, walking, hiking, yard work, nordic skiing, spring skiing
    Manufacturer Warranty

    Tech Specs

    • Reviews
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    Versatile and comfortable.

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

    This is one of my favorite synthetic baselayer tops. I prefer my baselayers to fit somewhere between "relaxed' and "snug," and the small in the AR fits perfectly. The sleeves are just the right length, as is the hem, and the quarter zip allows me to dump heat when I need to. The fabric itself wicks-away moisture, dries quick, and is super stretchy. I often wear the AR running, skiing, hiking, or climbing (it's like my Jane of All Trades synthetic baselayer). The flatlock seams don't chafe, and the underarm gusset ensures maximum mobility - in turn discouraging the hem from lifting and exposing your belly, which is a really great feature while climbing.

    Almost too warm for me, almost

    • Familiarity: I've put it through the wringer
    • Fit: Runs small
    • Size Bought: Large

    This top is so comfortable and warm, it's totally my go-to option for the colder ski days. The fit is a little smaller than I'm used to with other brands, but nothing that's stopped me from keeping toasty on the slopes! (I'm typically a medium in all tops that I purchase, but the large fit my chest much better, I'm a 32C for reference)

    I must also say that I hesitated with this purchase because I have a significant fear of zippers getting cold and freezing me out. No hint of that problem here at all!

    Nice articulated arm.

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: 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.

    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.