I saw it on TV and tried it myself. Not only does it not show sweat stains, but the fabric feels great. It didn't wrinkle even when I used the dryer, which was convenient. Although it's brand new and unused, it was purchased in a store. I have inspected it, but there may be oversights. Please understand this. ◎Product Description◎ Sweat-stain resistant and worry-free ◎ Short-sleeved polo shirt, Mok Gray ◎ Short-sleeved T-shirt, Black ●Product Features● ・Quick-drying function and special fabric/processing make sweat stains less noticeable! ・UV cut function for protection against UV rays! ・Easy care ・Shape-retaining function for worry-free washing ・For business or casual wear. A short-sleeved polo shirt that suits any occasion.