I am a conductor on a tourist railroad that operates weekends in Central Alabama. We wear turn of the century railroad uniforms year round, and have a combination of open air, non-air conditioned, and air conditioned cars. I am very impressed with the fabric and the wearability of the SP24 short sleeve shirt. The wicking ability of the fabric helps keep me comfortable even in the warmest, most humid days when I'm moving about the train. The shirt washes up nicely, is very comfortable, and I particularly like the two pockets! I highly recommend this shirt!