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When the thermometer drops outside and you know you'll be both chilled and working up a sweat outside, slip on Arc'teryx's warmest weight baselayer top—the Men's Phase SV Zip-Neck Top. While this top warms your core, a quarter-zip opening allows you to vent away heat at your chest and soft Phasic fabric aids temperature regulation at the underarms.

  • Composite fabric construction combines proprietary AR and SL fabrics from Arc'teryx in order to balance the garment's ability to insulate and move moisture
  • Phasic fabric uses synthetic fibers that feel soft to the touch and that aid the transport of moisture from the surface of your skin to the surface of the fabric where the moisture can evaporate
  • Encapsulated silver ions help the fabric resist odor-causing bacteria
  • Next-to-skin fit keeps this top close to your body for warmth, and moisture transport while the articulated design provides unrestricted movement at the arms, shoulders, and core
  • Flat seams feel smooth against your skin, unlike traditional seams which result in chafing
  • UPF 50-rated fabric allows this garment to offer protection against the sun's harmful rays during parking lot snowball fights

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Here's what others have to say...


Piece of Art!

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size
  • Height: 6'2"
    Weight: 177 lbs
    Size Purchased: Medium

I've tried this one at 4200 meters amsl, and i can tell you it kept me warm and dry. It fits closely to skin so I also use it for early morning hiking when its cold outside, the zipper helped when i got too warm and needed to cool down. It's the first Arc'teryx baselayer I use and I can say it'll be hard to switch back to another brand. Good to use as a layering piece or on its own in the early spring. I found that it retained the moisture from my sweat and left me feeling cool when I stopped. It is machine washable I'm buying more of this product.


Great baselayer

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 5'7"
    Weight: 145 lbs
    Size Purchased: Medium

An amazing piece! I use it mostly for skiing as a wicking layer during the winter (not spring). And it does just that. If I ever feel too warm I just unzip the top and the problem is solved. I've used it for rainy day runs as a stand alone piece, it maintains warmth even when wet. It fits closely to skin so I also use it for early morning climbing when its around 5-15 degrees Celsius outside. I don't wear it around the city because it just looks way to technical, which it is.
It looks exactly the same after half a year of use. I think the price is just right for this item. If you're looking for a warmer base layer I'd definitely recommend this one.


Essential Under Layer

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 5'8"
    Weight: 200 lbs
    Size Purchased: Large

When I first got into layering I thought wool was the rage, boy was I wrong. Wool certainly has its time and place and I would never part with my Patagonia pieces for multi-day hut trips or expeditions to ward off the stink but man, synthetic under layers are incredible especially when made by Arc'teryx.

The amazing thing about the Arc'teryx Phase SV is the sheer versatility. For touring, this piece works great for climbing under extreme physical exertion. The zipper is crucial, simply un-zip the chest to dump heat and continue on your way. Once at the top let the piece breathe and you'll dry out from your sweat in no time. The merino however will leave you soaked and chilly while your partners transition. Is it 12deg F and windy on an almost flat ascent? Throw on a shell, zip up, and keep moving. Did your buddy comp you a ticket to the local resort? Perfect, get your Phase SV on with your choice of a pro-shell and forget the forecast.

What are the limitations of this piece? Definitely 40deg F+ and sunny at the resort was beginning to push my comfort zone, however leaving the pit zips open with the Phase SV chest unzipped left me relatively comfortable. Anything below 10deg F (resort) or 0deg F and windy (touring) I typically throw a synthetic mid-layer on to add to the versatility of the Arc'teryx Phase SV such as the Patagonia Nano Air or Arc'teryx Atom LT. Fit wise, great, next to skin athletic fit just as you would expect from Arc'teryx.

Pro tip, put a cup of white vinegar (cheapest you can find by the gallon) into your wash cycle, it kills the bacteria that causes the stink with synthetics.

Feel free to hit me up at or 801-736-6398. I can talk with you more about the versatility of layering with this amazing under layer to help you with whatever pursuits you might contrive.


Arc'teryx Does it Again

  • Familiarity:I gave it as a gift but have feedback to share
  • Fit:True to size

I gave this as a Christmas present to my dad, and I have seen him wear this piece more than any other base layer he owns for hiking, biking, and even just casual wear. Definitely good to use as a layering piece for winter time activities, but will also be good on its own in the early spring and late fall. As you would expect with an Arc'teryx piece, it has so far been a versatile and durable layer for him, made from lightweight, but very warm materials. With the added benefits of flat seams and a UPF-50 rating, this base layer is most definitely worth checking out. As far as the fit goes, it was true to size through and through.


The Best Base Layer

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

Everyone hypes merino wool but this piece is now my go to base layer. It fits perfect. I am 5'11, 190 and a Large fits just right. It has a very athletic/next to skin cut. There shouldn't be any bagginess when wearing it. About the product: there is this SV Zip-Neck version and an AR Zip-Neck version. They are essentially the same product with a difference in warmth/thickness/stiffness. I wear the AR for days 65F-20F as my base layer and the SV for days 20F-0 or below as my base. It has been a year of heavy use and it still looks and feel great. Machine washable. Buying more of this product.

If you are buying the AR and the SV then I would recommend buying one color for the SV and one color for the AR. They look very similar in your pack and it is a pain when you are getting ready at 1 am for summits and start pulling out the wrong one.


Arcterys Phase SV Zip top

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

This is now my goto base layer for backcountry skiing and trail running in the winter. I was previously a diehard merino wool fan (Icebreaker and Smartwool)... while I love the 'non stink' factor, I found that it retained the moisture from my sweat and left me feeling cool when I stopped. The Phase material both wicks well and dries quickly.

The Phase SV is nice on cooler days underneath a windstopper soft-shell.

I wear a medium in the Phase lineup and also in Icebreaker and Smartwool tops.


Good High Quality Product

  • Gender:Male
  • Familiarity:I returned this product before using it
  • Fit:Runs small

The only issue I have with this product is the size. I always wear a large and am average weight. My height is six feet tall. This product was extremely tight throughout the body especially in the shoulders. Otherwise it seemed to be well made and very high quality.

The fit is "next to skin" so it will tighter and is meant to be a base layer.


Comfort, Style & Quality

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

Great layering piece that is carefully thought out from breathable side panels, finishing details, to overall fit. It's a great piece from Arc'teryx


soft light breathable

    was hiking couple times in low 30s breaths amazingly sucks the moisture from your body i put it on while i was sweating and this thing got me all dry in about 10 minutes while i was on the move, dries pretty quickly too.


    nice baselayer

    • Gender:Male

    the fabric feels good and the size is fine while the sleeves are too long for me

    nice baselayer