Riemann p20 oad sun filter spf50 100ml provides 10 hours protection from one just application and is very water resistant even after swimming frequently throughout the day its clear lightweight consistency ensures a silky and even coverage active 15 minutes after application its quickly absorbed non sticky and leaves no white marks the original spf20 is now joined by other factors an spf15 30 and 50 which come in a new easy to use spray thanks to its long lasting uva and uvb filters