Arc'teryx Men's Rho AR Top

Great, all purpose aerobic shirt
I just love the material of this shirt, it is the best wicking shirt that still keeps you warm when it is damp. Arc adds its own sewing and design and has created a great product. Sizing is small so I order a larger size. I also have a Rho LT which probably sees more action because this version is very warm for CA, I only use this top on cold winter days or when I go on an adventure...

Very Warm and Extremely Light Weight
Fits a little snug but extremely warm and light weight. A little pricy but worth it. If wool is too rough on your skin this is a good alternative. Easy to clean and maintain.

Very comfortable, super warm top. Absolutely love it. Wish it was a bit longer to tuck in, but is not to short by any means. 6'1" 165 and a Large fits perfect.

love it!
the warmest and most comfortable base-layer out their! the zipper dose not chafe and it stretches with every move! very warm by itself! the only thing its odors get trapped in it so wash it everytime you use it. buy it!

Absolutely great top baselayer, Since I got it, I didn't fear any cold weather, its could provide more warm than other baselayer I owned. It's so suitable in winter outdoor activities as it can be so breathable and stretch very easily while it provides warm. I love it!