I absolutely love this shirt! I've worn it running in 30-40? weather with a light weight shirt underneath and I am never cold. It is also wind, rain, and snow resistant! I could hardly see the other day running in a snow storm but my upper half was not damp or cold at all. Even though it's an off brand I highly recommend! Seems to be made well, has held up through a couple washes, and fits perfectly. I'll be buying more!