Welcomeif you are looking at this listing you probably are already aware of this, but there is more than one important reason to wear a upf50+ rash guard. The two most important are:1 a rash guard that is tested and rated at upf50 means it blocks over 98% of uv rays - without he use of chemicals sunscreens are not as effective as they claim to be and they are made of chemicals that are absorbed by your skin. When using you must apply a lot (one shot glass full) every 4 hours and make sure you cover all exposed skin. A rash guard eliminates this2 the chemicals in sunscreens have been proven to kill coral reefs. The us national park service estimates that over 6000 tons of sunscreen is dumped over coral reefs by snorkelers every year by just wearing a rash guard you can reduce the sunscreen you release into the ocean by up to 90%. Our rash guards are reef safe. Now you can design your own shirt:1 add pictures2 add text3 print on front and/or back4 pick your color - if the color you want is not one of the options, let us know and we will do our best to make in your color. We use state of the art dye sublimation equipment and/or silkscreen which allows us to print most things, including photo quality images. And our fabrics are high quality, upf50+ tested polyesters (we have to use in order to dye sublimate).