These shirts are perfect layer shirts. They fit true to size and are thin enough to layer but thick enough to not see through. The sleeves are actually long enough on someone like me, with long arms--this is unusual. Usually my wrists are sticking out of shirts but this fit pretty darn well. Also the length was good enough to not ride up.  If you're looking for something with highly thermal properties, this isn't it but for most other uses of a long sleeved v-neck, it's good.