Our old threshold was $75, which meant a single tee never qualified. That felt like the wrong incentive, so from this month anything over $50 ships free within the US.
International rates stay flat at $19.95 for now. We are working on regional warehousing to bring that down.
The pullover runs closest to true size. If you are between sizes and want room for a layer underneath, go up one.
The zipper version is cut slightly longer in the body, which most people prefer if they are taller than about six foot. The pocket version splits the difference and is the one we reach for most often.