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Breathable and warm, a midweight baselayer for most cool-weather adventures.

Don't be a casualty to the cold. Pull on the midweight Arc'teryx Women's Phase AR Bottom for layerable warmth when cooler days arrive. Whether you're running wind sprints, chopping wood, or skinning up untracked snow, the Phase AR bottom has you covered. Constructed from two technical fabrics, Phasic AR and Phasic SL, this bottom excels as a layer during stop-and-go activities. Phasic AR fabric retains heat, while Phasic SL material in the panels provides an outlet for a surfeit of sweat.

A combination of flatlock seams and gussets behind the knee and in the crotch lets you move freely without high risk of chafing. The entire bottom contains encapsulated silver ions to reduce odor build-up, though the ions won't change the fact that you ate beans last night. Grab your ice-climbing pants, ski pants, windproof running pants, or jeans and get outside knowing you'll stay warm in the Phase AR Bottom.

  • Phasic AR body, Phasic SL panels (behind the knees)
  • Encapsulated silver ions
  • Flatlock seams
  • Gusseted crotch and behind the knee
  • UPF 50+ (body)

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Here's what others have to say...

5 5

perfect baselayer

  • Familiarity: I've used it several times
  • Fit: True to size

I bought these as a baselayer for snowboarding and they are amazing. I'm 5'2.5 about 125 lbs and ordered a small, they fit great. They keep me warm and dry while boarding in cold conditions. I tend to get hot easily and don't like super thick/multiple layers underneath my pants but these are light, breathable, and overall very comfortable. Some baselayers can be itchy/uncomfortable in the seams/tight around the waist but I didn't find any of these issues with the AR bottom. I got the seaglass color and it is true to the image. Would totally buy multiple pairs of these.