Riemann's unique P20 formula is non-greasy, non-oily and fragrance free to provide the ultimate coverage, both in and out of the water, for up to 10 hours a day *. Once-a-day application P20 is designed to ensure one application a day is sufficient, keeping the time spent reapplying sun protection to a minimum. Once-a-day application means a little goes a long way, making P20 more economical than other sun preparations that need to be re-applied regularly during the day. Superior water resistance Our once-a-day formula is proven to remain effective even after frequent swimming. In fact, P20 has been categorised as 'Very Water Resistant', the highest classification available from Colipa Guidelines for Evaluating Sun Product Water Resistance**.