I've used both the lightweight and midweight shirts and they have been fabulous. I've gone on hikes on 40 and 60 degree days and felt these layers are perfect. Some people have said the sleeves are too long. Perhaps they are for shorter people. I'm 6'2" and they are perfect! To those w/short arms, I say "roll the sleeves, or hem them." Maybe that's not what you want to do when buying a $90 item, but if sleeves are too short there is no getting around that.