After a bad sunburn after snorkeling (only a T-shirt was then but little something to protect the poor and neck) I bought the UV300 shirt. Solid quality, as there is nothing to complain about. Over the wrists are still tabs from wire to prevent the slipping of the sleeve, a plus. Despite the white substance, the shirt is not transparent in the water.
Unfortunately, however, slipping the whole shirt when wearing it along with the swimsuit, over the pants cuff up, you zuppelt constantly around. The shirt slip into a pocket looks wurschtelig.