Began wearing these as a firefighter as they provided unconstrained movement and were particularly durable despite the abuse they received. I have since found them to be one of my favorites for cool weather layering and for very casual wear.
These t-shirts just feel good on, look great right out of the dryer and are holding up very well. I've had some mylenoma so I wear the long sleeved ones all the time. Since they are a good buy I've bought about 12. I definitely recommend them.