Nice weave on this 150 weight. Soft, warm, versatile. I could wear this in relatively cold weather for vigorous activity..granted, I run a bit warm compared to some, but that makes light merino layers like this invaluable. The extra long sleeves are fine due to the relative tightness on the forearms..they don't get in your way. 5'11 185 and I have the Large, fits great..doesn't look like I'm wearing compression gear, yet still form fitting enough for easy layering.