These things are the best for hiking. They breathe like no other, yet still keep you warm. If you put a hand warmer in the chest pocket over your heart you wont even notice the cold if you stay active. Wont hike without them.

Fit: 6-4; 235; 46-47" Chest; 37/38" sleeve. Fit well in the body, not too tight. Sleeves were too short - could've used another 3 inches or so.

Performance: Not as absolutely warm during periods of inactivity as I was hoping for. My first experience with Capilene. Seems better suited to active pursuits. I wore it alone as a top for a run on a 30 degree morning and was fine - warm and dry. I wore it beneath a heavy work coat and The North Face Magic softshell on a few 15 degree nights where it was stop and go at work and froze when I wasn't laboring.

I really like this baselayer. It is well fitted, and breathes well. I recently used it on an uphill hike and it kept me warm without getting overheated. I think it will work great as a baselayer for skiing.

As base layer, or next to lighter weight/silkweight capilene, this Cap 4 top offers versatility and feedom of movement and is extremely warm when used alone or in cinjunction with a fleece. I wear it alone with the R4 fleece and am very comfortable even at altitude or on a cold windy New Mexico winter day. I recommend it highly.

I never leave home for skiing, winter hiking, etc without this layer. It's soft, it wicks moisture, and it looks good even for casual wear. Like others have said, it keeps the stink down, which is always a plus.

The description of this item on this site is 100% accurate (believe it or not, it really does keep the body odor to a minimum). I wore back country several times in a variety of conditions and it performed superbly. Highly recommend.

The Patagonia Capilene Zip Long-Sleeve has a great weight to warmth performance. It makes a great first layer for high country backpacking or cold weather activity. My only concern at this point (used for one 8 day trip) goes to durability. My impression is that this fabric requires care to avoid snags as it seems rather easily damaged.

I just received my Capilene 4 and I'm very happy with it. It is extremely warm for how thin it is, and a great base layer for any outdoor activity. I live in Wisconsin so it can get extremely cold, and with this shirt I will be warm all winter! I can't take this thing off.

I dont think you can ever go wrong with Capilene. This layer 4 heavyweight long underwear is warmer then most for those really cold days. Fits pretty true to size. I am 6'1" 170 and wear a medium.

Patagucci does not fail in quality once again. This midweight baselayer is not only tough enough to withstand abuse, but will keep you dry and warm on a windy, cold day or on a sweaty, hot backcountry day.

Fantastic top, regardless of the activity! Keeps me just warm enough when it's cool out, and manages warm temps better than any other base layer I've had. (Which is to say it beats 5 or 6 other big names.) Perfect for layering under my softshell. Fit is a touch on the snug side, as it should be for a wicking base layer. At 6'1", 185 lbs, a medium is just the right length in the arms and the torso, neck fits good, and it has a nice long zip for when I want some extra ventilation. Chest pocket is nice too. Really, the only place I don't like the fit is around my belly, which could use a bit of work anyway :) Does seem a bit likely to snag, but I haven't had that problem yet. All things considered, I'm not sure I'll ever buy anything else.

Great fit, comfortable and warm.

Recently climbed Aconcagua and bought this as a versatile inner layer to help handle the varied weather. We had very good weather overall and the zipper neck on this shirt handled everytning from snow, sleet, wind and rain to the gorgeous sun filled sky that we had on summit day. It also performed well after 16 days on the mountain in minimizing retained body odor.

I got my Patagonia Capilene 4 Zip-Neck Top for christmas about 8 years ago and Long underwear also. I work outside and wish I had a pair for everyday of the week. The knees have holes but the shirt is like new.Want to find out were I can buy them as local as possible. I live in Bowmanville Ontario.Thanks