“The material is the star here. The lightweight nuyarn breathes well and doesn't get heavy when wet. I ran in the long sleeve version in a marathon that was between 38-41 degrees during the race and I ran much of it with the sleeves pulled up after warming up. The medium has a relaxed fit for me but hangs down too far for my 5'7" frame. The small is more of a tech tee fit which is great for running but I wouldn't hang out in it due to the tight fit.”
