Riemann p20 once a day sun filter spf20 is perfect for people who like swimming in the sunshine p20 once a day sunfilter is simply not like any other product it is a unique product as it needs to be applied only once a day so you can simply get on with enjoying yourself active 15 minutes after application it is a unique product as it needs to be applied only once a day active 15 minutes after application theres no need to re apply the product so you can simply get on with enjoying yo