Admittedly I run cool, was born here. But ride to work in the Merino wool t-shirts from Unbound or silk/Merino thin knit sweater and also merino socks, and arrive absolutely presentable, so much better than cotton, not better than linen, but better looking for an office. Only the v-neck though, can't stand it near my neck, that does itch. And not all brands, only Unbound for the T-shirts. Silk/Merino blend always rocks.