It works exactly the way you want it to. Above 55 F and below 75 F, this thing maintains optimal temperatures. It's breathable enough not to turn into a sauna, but warm enough to keep you warm. This is my favorite running shirt. I liked it so much that I bought another one. It's lightweight, so don't worry about it interfering with your stride. If I wasn't a poor college student, you'd have a hard time convincing me to ever wear another shirt.
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