It comes in a 200ml pack. P20 sun protection spf20 one app a day is enough to feel protected. It is very water resistant (the highest rating that exists). It remains active and retains the same level of protection after 80 minutes in the water. It offers broad spectrum protection against uva and uvb rays while retaining its effectiveness even after prolonged exposure to the sun. It is easy and comfortable to use as it provides a thin protective layer that ensures uniform coverage on the skin. Using riemann is a great saving as it only requires one application per day to stay protected from the sun.