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. It's brand new and unused, but it was purchased in a store. I have inspected it, but there may be oversights. Please understand this. ◎Product Introduction◎ This short-sleeved polo shirt in Mok Gray is great because it hides sweat stains and you don't have to worry about them. ◎Short-sleeved T-shirt in Black ●Product Features● ・It dries quickly and is made with a special fabric and processing that makes 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.