This sunscreen has been tested to 50SPF and water resistant for 2 hours. However, batch production can change and like all sunscreen use we urge you to err on the side of caution, hence our 30+SPF and 80 minute water resistant description. SPF and water resistance changes with waters, heat, sweat and is different for individuals. please read our blog on applying and reapplying for the best proctection. Remember, sunscreen is not substitue for covering up and seeking shade in our harsh sun conditions.