Buy a wardrobe seriously
I have six of the Patagonia Capilene 1 Black Large shirts. Now I will not wear any other shirt. I've been wearing them every day for two months plus and I'm wearing one now. Any condition. Dry. Under warmer layers, warm. It's hot here in the NM desert, and I'm cool. Great in the mountains also. Best of all, chicks just can't get enough of me after my Backcountry shorts and esp. this shirt.