Free 2-Day Shipping on Orders Over $50* Up to 25% Off Marmot– Save on Clothing and Gear


Lightweight boy-short undies with wicked wicking abilities.

The Arc'teryx Women's Phase SL super-light boxer briefs are engineered for optimal moisture management during stop-and-go activities. During active phases, moisture is wicked across the entire garment, aiding temperature regulation. Entering a rest phase, the broadly dispersed moisture evaporates quickly to keep you more comfortable.

  • Hydrophobic, moisture-wicking, breathable, quick-drying
  • Encapsulated silver ions within fabric
  • Flatlock seams
  • UPF 25+

Share your thoughts



No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

    Add a:
  • Share a photo
  • Share a video


Product Fit:

Add Your Size


Height (ft, in):

Weight (lbs):

Size Purchased:

Only jpg, jpeg, png, gif or bmp files please.

Now review from the App.Download

Here's what others have to say...


Careful with sizing

  • Fit:Runs small

I usually wear a size medium in something like this (all my stoic boy short's are mediums and they fit great) but the mediums in these ride a little lower than i'd like in the back, and if you re-adujust the back then you loose some leg coverage. Thus I'd think about using your pants size (I would usually get a large) rather than underwear sizing (am I the only one who thinks these two things differ?).

Having said that - these FEEL AMAZING and are simply the best material for something like this that I've tried. They are super comfy, and great to have - especially if you can pick them up on sale. 45$ is a little steep in my opinion for something like this considering other brands start at around 25. Yes, I know you make great stuff Arc'teryx - but really -- make your prices for stuff like this a little more reasonable? please?

another comment though - they retain odor waaaay more than any of my other synthetic or merino underwear... major downside.