I was already a smartwool lover before I purchased these shirts, though everything else I own was for cold weather. These are great layering pieces for hiking and skiing and I have used them for both. I use them for work under my uniform and it really prevents that nasty stick to your skin feeling you get from cotton. Keeps me cool in the summer and warm in the winter. I will be purchasing more, price tag is completely worth it because they are showing no wear despite constant wear and laundering. I', a 6' female with a muscular shoulders and narrow waist and the large fits perfectly without being skin tight and there is not a ton of excess around my waist when I'm trying to layer.