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Lightweight InsulationLightweight Insulation


Moisture management for the backcountry explorer on the go.

Don’t get phased by the cold. Just pull on your Arc’teryx Phase AR Zip Neck Top. Lightweight design provides optimal moisture management when you’re on the go.
  • Breathable fabric includes antimicrobial fabric treatment and encapsulated silver-ions to resist odo r season after season
  • Mechanical stretch enhances mobility, giving the Phase AR Zip Neck utility for a variety of sports
  • Lightly insulated and lightly lofted but warm insulation
  • Flatlock seams and laminated chin guard ensure comfort and prevent chafing even during extended use in the backcountry

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Review Summary
9 4
2 3
1 2
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Arc'teryx Phase AR Zip Neck Top - Long-Sleeve - Men's

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Here's what others have to say...

5 5

Great layer

  • Gender: Male
  • Familiarity: I've used it once or twice and have initial impressions

So far this is a great piece. Just what you expect from Arc. If you are on the fence get it and you will be glad you did.

I am torn between this layer and the RHO....

Posted on

I am torn between this layer and the RHO. Does anyone have any experience between the two? Ill be mostly mountaineering, alipne climbing and ice climbing.

Responded on

Josh, the Phase base layers are designed for aerobic, high output activities with frequent work/rest cycles like backcountry skiing and winter trekking. The RHO products are designed for slower placed activities in colder temperatures such as ice climbing and winter trekking. I'd look at the RHO AR or RHO LT for the activities you listed.

Can this be used as a middle layer?

Posted on

Can this be used as a middle layer?

Responded on

Ray, this is designed to be used as a base/next to skin layer and fits as such. You could wear it as a mid layer with a silk weight base layer if you so desire. The Phase is designed for highly aerobic activities, thus it wicks and dries extremely quickly. If you're participating in an activity with fewer work/rest cycles an insulating layer like the Rho AR Top would be better.

5 5

Perfect base layer

Creates the perfect climate: warm, breathable, fast wicking, quick drying. Very comfortable on the skin. Perfect piece of gear for aerobic pursuits without getting cold when stopping.

5 5

Love it

Fits well and great for my trail runs. Also works well under a windbreaker. Would purchase again.

5 5

Excellent Travel Companion

Great in all kinds of weather. Recently packed it for a football game in the Northwest, and it kept me warm as a base layer with a shirt in an October evening rain.

I'm 6'4, 180, 41 chest, trying to decide...

Posted on

I'm 6'4, 180, 41 chest, trying to decide between M and L. I want to use this as a snug base-layer but don't want it to be too short in the body or arms.

Responded on

I believe Arc has fairly long arms so you could probably go with medium. At worst, Backcountry has a great return policy.

5 5

everything but a pocket

The Phase AR has quickly and single-handedly replaced several other layering pieces including Under Armour, polyester shirts, and lightweight jackets in my wardrobe. Lightweight enough to run under a cycling jersey for chilly mornings, but still warm and comfortable enough to wear on its own for a trail run. Come winter, I imagine it'll be the idea base layer for skiing as well. Haven't had any problem with stink, but then again I tend to stay away from onions and asparagus.

* I'm a lean 6 foot, and the Small is a perfect, against-body fit. piece has a tall zip neck, and runs slim and long - size accordingly

5 5

Great Top

Looks cool, feels warm, fits great. My first Arc'teryx garment. I'm sold.

3 5

Toasty warm but Stinky

I wore these in -20C as a base layer with a fleece under my jacket. Didn't feel a thing, infact at times I took the fleece off when the sun came out and the wind die down. But it did smell at the end of the day.
I also have IceBreakers and for the price I would use IB over these anytime. These Arcteryx are pretty expensive.
I gave it 3 stars only because it was warm but I would not buy them again.

5 5

Arcteryx - my favorite?

Arcteryx does it goood.The soft material size M fit perfect on my 5'9" 155lb frame. The long arms are a plus and no real need for thumb holes. No irritation to the neck when zipped up either.

During a recent single digit cold weather hike I manage to break a good sweat while double-timing. I unzippied to my Phasic AR baselayer and cooled myself, all the while the Acteryx was wicking the moisture away from my skin. This all occured after I had worn the same shirt on six other occasions; three day hikes and three all-day outdoor work sessions. All involved some level of perspiration. Following the day after my double time hike I was threatining to wear the shirt for a seventh time as it had absolutley no odor form any part of the garmet including the conspicious pit area. I could not believe it.
Alas I could not bring myself to wear it without a wash even though I am sure no one would have noticed. Great product.

5 5

Best I've tried

I think I've tried so many brands of long underwear including Craft, MH, Smartwool, Ibex, EMS, Mammut but never found anything that kept me really dry. I've used underwear mostly use my base layers while backcountry skiing so I'm either pumping out the sweat on a climb or cool on a descent. It's a tall order for any garment.

The Phase AR top is far and away the best I've tried yet. Seems to stay dry in all situations and has surprising warmth for a thin layer. I couldn't be more impressed with the piece and immediately ordered up a second top. Well done Arcteryx!!

4 5

Nice n Breezy

Wicks and dries as advertised. Nice light layer, but it does not insulate much at all, which is why it works so well. The cut is Arcteryx perfect and the material doesn't smell as chemical-ly as many poly shirts do. Also, the feel of the Phase is a little slicker than some other Power Dry fabrics. The blue is color is straight out of the toy box.

5 5

Nice layer!

This top is great. It wicks away moisture while keeping me warm. The material is a bit different compared to a fleece top but it is still soft. The arms seem longer then some of my
Patagonia's. I plan on using it as layer.

4 5

Great Next To Skin Layer

I got this piece in the Graphite color in a L. I am 6ft 3in, 190lb with a 43in chest. This is quite a tight shirt. I have only used this as a next to skin under layer and it has worked really well. It you want a more loose fit, I would size up. Another great product from Arcteryx.