High Performance Sun Protection Custom Apparel SPF and UPF tee shirts from a picture, photo, drawing of your fishing boat, yacht , tee shirts for men youth women. custom dye sublimated shirts. SunTech Protection UPF 50 technical fishing shirts-our shirt meet all the demands of professional angler. performance 100% MicroFiber performance moisture management anti-microbial finish Wicks moisture away from your skin in addition to providing odor control dri fit technology Ultraviolet Protection Factor (UPF) is a rating system used for apparel. It indicates how effectively fabrics shield skin from ultraviolet (UV) rays. The higher the UPF number, the greater degree of UV protection a garment offers.