riemann p 20 once a day spf 50+ provides 10 hours protection from one application & is very water resistant even after swimming frequently throughout the day. great for all the family including the children whether you're lazing by the pool on holiday outdoors playing sports or just enjoying the garden at home. perfect under make-up or moisturiser & for men with a thinning scalp, once a day application, 10 hours protection, water resistant