I've used this shirt during morning cardio workouts in Arizona, to backpacking at 12000 feet, to walking in New York in November. This is a great base layer, and the wind proof/water resistance has been a great feature. I can pair this with a sweatshirt and stay comfortable in most weather conditions. The shirt breathes and moves very well.

I tried the Mountain Hardwear version of the WindStopper top a few years ago and nearly broiled to death. This new Marmot version has it figured out. A lighter version of the N2S WindStopper and venting panels in the armpits make this piece very functional as a wind and mid-layer. I wear mine with some silk weight underneath to improve the feel and wicking power. I love it for Nordic skiing and wear it under a soft shell or insulating piece for going downhill. Recommended.

This is a great shirt. You can wear it as a base layer or over a base layer. It's extremely breathable and does a great job of blocking wind. I was able to keep warm with this and a base layer at 10,000ft while hiking in the Sierras. Other hikers with more and thicker layers were having trouble keeping warm. This is an absolutely fantastic product.

My name is David and I recently purchased the Marmot Half Zip Evolution long sleeve shirt from backcountry. Never have I bought a product and gotten so much out of it. I went to the high Canadian arctic to a national park called Auyuiittu. I hiked through ancient glaciers and fjords for over eight days and the Marmot shirt was on me 24/7. It was a perfect mid layer, or even base layer when the sun was out and the wind finally stopped. It is definitely worth the money. I am going to buy stock in marmot. Completely water proof, highly breathable, and more comfortable then gods own robes.
If it works 150km north of the Arctic Circle, and delivers these kinds of results, then you know it’s good.

The Marmot Evolution Half-Zip is an excellent shirt and shell for winter running. I live along the Hudson River in New York State and the wind can be very strong and cold in the winter. Around 40F the windshirt can be worn next-2-skin as suggested. When it's colder or very windy, I wear a silkweight or midweight baselayer underneath. This shirt equilibrates very quickly and keeps me consistently warm regardless of my energy/heat output. It never overheats and vents moisture rapidly. I'm more motivated to get up early and start my runs because I know I will be comfy. Note that this shirt provides little to no insulation and is at its best when the wearer is generating heat. Cheers!

This shirt worked like a charm during a Grand Canyon rim-to-rim-to-rim excursion. The shirt closes easily and provides a little extra warmth in low temp conditions. The stretch panels allow an excellent range of motion. Now for the bad part. I noticed some fraying on the seams connecting the 2 different fabric types. After 2 washings the seams had multiple small holes thought their length. If I spend this much on a shirt, I'd like that shirt to last more than a couple washes.

Great construction allowing for a wide range of movement. My only complaint is the sizing is a little on the small size, although it is meant a base layer. If you are planning to use it as shell consider a size up.