After a long weekend of climbing at sunny crags in Wild Iris under a blistering high altitude sun, I have to recommend this hoody. I wore it all day in the sun while people around me were peeling layers off down to their bare skin. The difference: I wasn't sun thrashed or sunburnt. OR knocked it out of the park with this one. So comfortable and stretchy. Climbed and belayed in it. Breathability is the huge benefit here.