Montbell - Domestic Genuine Geoline Cool Mesh Arm Fit Shirt Men's Black (BK) There are wrinkles as shown in the photo. This is underwear suitable for sun protection in the summer. It uses different materials for the body and sleeves. The body uses Geoline Cool Mesh, which has excellent breathability and quick-drying properties, providing a refreshing feel even in hot weather. The sleeves use a highly UV-cut material with a thin, stretchy feel that doesn't constrict. Combined with short-sleeved T-shirts, it effectively prevents the unpleasant stickiness of sweat.