I currently have several of these shirts through multiple purchases. This is a medium weight shirt. In my opinion, they are much warmer than an Under Armor or Nike shirt of the same weight. (at a much lower price!) I use this shirt as a base layer when training in cold weather. That's why they're really warm. From 20°C I find them too warm - only with a lined windbreaker. I also wear them for a short morning walk with my dog. I wear one of these shirts, a t-shirt and a lined windbreaker for temperatures up to 4°C. We're out 55-60 minutes and I never get a cold - and I'm the kind of person in the office who always has a heater on. Durability is not comparable to the brands listed. Two of these shirts began to have their sleeve seams unravel during a cold season (which of course is a long time in Colorado). They are often worn and washed. However, other brands have gone through the same treatment and held up well. The problem isn't that a quick stop at the sewing machine won't fix it. The fabric itself is durable. Honestly for the price difference and warmth for the weight difference. My first listing covers that, and the fact that I plan on buying two more says the rest.
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