The polo shirt is more formal than the T-shirt. If the polo shirt has 50mm reflective tape, then it will be not only formal but also safe in your working life. So why not choose workwear like this style? Polo shirts are a good choice for working on warmer days. it can also be worn in your spare time. 

 it is for safety to help you stand out and stay safe in you are working. 
With moisture-wicking capabilities, pulling the moisture away from your skin. Making you feel comfortable throughout the day. The 360 degrees of reflective tape on the polo shirt high visibility help you to be seen.