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The Arc'teryx Women's Phase SL Short-Sleeve Crew serves as your go-to tee for your high-mountain aerobic pursuits. Whether you wear this silkweight top alone or under winter layers, the Phase SL wicks moisture, dries quickly, and breathes exceptionally well so you're not a clammy mess while you tour, ski, hike, or mountaineer.

  • Phasic SL features multidimensional polyester yarns that wick moisture laterally to dry quickly and polypropylene yarns with silver-ion encapsulated into the fibers that provides long-lasting odor control
  • Lightweight fabric has a smooth outer face that enables the Phase SL to slide easily under other layers
  • Next-to-skin fit layers nicely beneath other layers
  • Flatlock seams eliminate annoying chafing issues
  • UPF 25-rated fabric shields your skin against the sun's harmful UV rays
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Big Fan of Phase SL

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: small

I have these short sleeves and also I have a long sleep zip up. Feels great on skin! Took the long sleeves ones on a backpacking trip in Alaska! Can't run out of good things to say about these. Runs a big small on the shoulder but I do have pretty wide shoulders. The body of the shirts fits true to size.

Nice but small and see through

  • Familiarity: I've used it several times
  • Fit: Runs small

I really like this shirt but it runs waaay small - I'm usually a L in Arc'teryx and even the XL in this is very very tight. They really mean next to skin when they say it! The material is great but unfortunately the light orange color I ordered it in is see through so I wish I had a different color because the one I have currently doesn't work well as a cute shirt for summer hiking for me.

I really like how long the sleeves are and wish more short sleeve shirts had longer sleeves!

Phase SL works

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

Arc'Teryx website has a video explaining how Phase SL fabric works. It might sound like a gimmick, but the fabric does work. I wear this shirt running on this summer's hottest days, and I've never soaked the shirt. The fabric absorbs the sweat and just disperses it. The fabric also feels quite airy, super lightweight, and soft against the skin. Because it doesn't have any fancy looking contrasting panels, there are no extraneous seams to rub you. New to this season is the UPF rating. I have a Phase SL tee from 2 seasons ago and it was not rated. It really gives me a peace of mind when I'm out for a few hours under the sun, knowing that I'll be moderately protected. Next I'd like to see Arc'Teryx using a UPF50 fabric. Previous season's Motus crew uses the same Phase SL fabric, yet had a UPF50 rating.