Tailwind has gone above and beyond with this tech shirt. Very easily they could have given us a tech shirt from any random company carrying their logo, but instead they choose to go with Patagonia. I have 4 tailwind tech shirts (2 white and 2 blue) and I love them, but the blue one feels sleeker...sorry cant find another word for it. I have used it in Buenos Aires, Argentina this summer (their winter). The first week i arrived there was 100% humidity which felt like walking into an oven, but the tech tee performed well remaining breathable and comfortable despite not bone dry (it was 100% humidity after all) so I was able to comfortably log a few miles. This week their winter started, this shirt under a running jacket is a lifesaver. Its comfortable, does not have pronounced side seams so it remains really comfortable while layered. if you are a fan of TW and need a tech tee that performs well pick one up.