This loose comfortable cotton shirt is well made and my favorite when the temperature is over 30 degrees Celsius. In very hot sunny weather, I prefer long sleeves, because the sun heats up the skin terribly, even with sunscreen. I wore this shirt in 106F with open sleeves and it was noticeably more comfortable than all my synthetic shirts. Unfortunately, however, it is becoming increasingly difficult to find such well-tailored 100% cotton shirts.