The original KōSTL sun shirt. This shirt is ideal for spending some good quality time outside with your friends. Whether your being active- fishing, hiking, surfing, paddle boarding, kayaking... this is the shirt for you. No need to apply that sticky sunscreen... well, at least the top half of your body.
Our sun shirt features UPF 50+ sun protection, the Solar Performance fabric is lightweight, comfortable, and sure to keep the sun’s rays from penetrating through to your skin. The fabric is powered by PURE-tech™ moisture wicking technology.