In autumn, the temperature can range from 30 to almost 60 degrees during morning runs. I have a selection of long sleeve running shirts. On cool days I choose this sweatshirt. It's a little thicker than my thin shirts and offers a few degrees more warmth. The interior feel is more like a matte material than pure nylon/spandex. I can wear this sweatshirt all day. Now it's become my go-to sweatshirt on chilly mornings. Not sure how far I can go in my 30's before putting on my winter gear, but this one is really good.