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Spring brings big, wet storms and milder temps, so slip on the silkweight Arc'teryx Women's Phase SL Zip Neck Top before you go touring far into the backcountry or up in altitude. It provides ample warmth as an ultralight baselayer and silky-smooth layering capability, and the Arc'teryx Phasic SL fabric breathes and wicks away sweat for cool, dry, nonsticky comfort.

  • Soft, silkweight hydrophobic double-knit Phasic SL boasts mechanical stretch, moisture-wicking and quick-drying capabilities, and silver ions to combat odor
  • Light, silky feel allows easy layering and ultra-soft comfort next to skin
  • Flatlock seams prevent chafing discomfort
  • Zip neck lets you regulate temperature and coverage
  • Protective UPF 25 gives you a shield against the sun

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

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Here's what others have to say...

5 5

Surprisingly burly

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Height: 5' 3"
    Weight: 125 lbs
    Size Purchased: Medium

I've had this top almost a couple of years now (you can see in the pic that it's a previous year's color) and always thought it was pretty good. I spent a little bit of time treating it gently because the material is so lightweight...it feels fragile, and with the price tag I really wanted it to last. But after a few offwidths and chimneys I just couldn't resist, I can say that I've really put it through the wringer now. I use it mainly for climbing in moderate weather, and I've also used it as a baselayer for snowboarding or ice climbing.


The material hasn't pilled, snagged or ripped in spite of some chimney moves on pretty rough and sharp granite. You might be able to see the more of the rock in the attached pic (though this obviously isn't the chimney...here I'm cruising up a 5.fun to put in a redirect for our TR anchor, but you can see much more of the shirt).


This shirt doesn't hold on to smells the way some synthetics do. Because it's so light it dries very quickly, which is great for overnight washes. By itself it's almost as cool as a t-shirt, but with the extra protection of a high neck - which you can zip down for a little more ventilation - and sleeves. As a baselayer I found it doesn't really add much warmth, but it does wick like crazy, which is its main advantage for me.


This top is meant to be sized very tight, which maximizes the wicking features of the fabric. The more skin it touches, the better it will wick. I'm usually a small but still had to size up...it's still a snug enough fit for wicking but I'm actually willing to wear it in public, if we stop for snacks or something on our way home from the crag :) That said, my shirt is from 2013 or so, so it might be worth talking to a gearhead about sizing before you commit in case something's changed.

Surprisingly burly
5 5

Phase SL zip Neck Top

by the lightness of fabric. I thought it would not be enough on a chilly 50 degree morning, but it did the trick! Comfortable and flattering always work for me. I love the 1/2 zips. Wish it came in more colors!!