Not sure how the temperature aspect works...the Light Steel showed sweat stains very quickly, which is not something I want if I'm wearing it around to do errands (I wear grey when I work out because I like that it shows how much I've worked up a sweat, so this'll just be worn during training). The body is a bit baggy and the sleeves are a bit on the shorter side. Would recommend sizing down if you prefer your clothes a bit snugger and if you're between sizes. I am 5'8, about 195lbs, 36DD and usually wear either a Medium or a Large depending on the fit. I ordered the Large but will order these in Medium in future.