Total game changer for me! I work 12 hour days in the hot sun and always use sunscreen to protect my skin and tattoos. I've been wearing them for a couple of weeks and not only do they protect me from the sun, but they are noticeably cooler than when I'm wearing a t-shirt. White reflects the sun and a breeze blows through the shirt. If I order more of these, I will not work in the sun without them again. *They run a little big, so I ordered one size smaller. I'm usually XL, but L is perfect.