These shirts run tight, so I would recommend going up one size (I'm a skinny 5'9" 140 lbs and I feel like a sausage in my small size although I can fit in it. I also have a medium which is less compressing). While I do think it helps my posture and helps avoid neck/shoulder stiffness... overall I like the long underwear bottoms better (compared to regular long underwear tops and bottoms).

The material is very comfortable and indeed does seem to handle a wide range of temperatures well... I've worn it snowboarding in the winter (with a windproof shell) like 35-40 degree weather and then again hiking the glacier snow in July in 60-65 degree weather (feels like 75-80 in the sun when you are wearing snowpants and a shell). While it was a little cold in the former and a little warm in the later, I really haven't worn anything else that could handle such a temperature range at all.

I wore this top on several of my long runs while training for an ultramarathon, and then during the race as well. IMO, the support web functions really well. On runs longer than 2 hours, I used to get pain and fatigue in my shoulders and upper back; this top eliminated that by supporting the muscles, reducing bouncing, and improving my posture. It sheds wind and insulates well enough to wear into the low 30s. Any colder, and I would recommend an additional layer

I really like the support and it does a great job of keeping temperature regulated. I was also impressed with how well it kept wind from making things cold. Keep in mind that this is top is skin tight. I have a lean build and its definitely form fitting. Hardest part is putting it on and taking it off. But comfortable once you get it on. Would definitely reccommned it if you want warmth without the bulk.

I bought the CW-X pants and they were good. So, I bought the CW-X top and it was horrible. I wore it on a 38F day, sweated like never before, and therefore, I felt like I was literally running in a cold, drenched shirt the whole time. I thought it was supposed to be like dry-fit. Hardly. I was really disappointed.

I got the CW-X pants earlier this winter. They were great, so then I got the shirt/top. It was horrible. It was really tight, and it obviously didn't "breathe" at all. I was sweating bullets at 25 degrees.

I bought this top as a base layer for in bound skiing. I like the fact that it has insulation (much better than my old ColdGear by UnderArmor). I like the support that it provides. The thumb loops can be a bit of a pain, but they're worth it. It keeps the top in place so it won't ride up like others I've owned.

I'm on the snow 7 days a week 5 months a year, this top helps my back and keeps me warm or cool.I also use as a base layer for my road bike in the fall. I did a century in Heber wearing this garment.It was 32 or less and I felt fine.Buy this stuff it Reeally works!!!

I've used CW-X tights in the past, but this is the first CW-X top I own. I highly recommend trying this upper body wrap system. It makes a tremendous difference in supporting my upper back area and I don't get tired as easy. The fabric is very nice and keeps me warm when temps fall below 50 but it's not too hot either. I would recommend this product to anyone who participates in winter sports.

Nice top, it’s sized smaller than I'd expect since I can normally wear large to X Large shirts. I bought the X Large and it felt extraordinarily tight. Otherwise, this is a great top. It wicks moisture effectively and insulates quite well during vigorous exercise in winter outdoor weather. It washes well and dries quickly. It’s a good quality top. I'd buy it again, but in an XXlarge minimum, though I'm not that big of a guy.

Seems temp is best down to 30's after that more layering is needed. Be careful of windy days. Good fit, good support.

I wore this shirt on a longer run in the northeast after work in November, it was about 30 with a mild wind and my upper body was perfectly warm. The shirt worked so well I just bought the tights for running in the winter.