3 oz: For maximum benefits, use the EltaMD SPF UV Sport Water-Resistant Sunscreen every day before exposing your skin to harmful UV rays.Apply liberally and evenly to all exposed skin areas, 30 minutes before exposure to the sun. Reapply every two to three hours to maintain protection.
7 oz: Apply liberally 15 minutes before sun exposure. Reapply after 40 minutes of swimming or sweating, immediately after towel drying, and at least every two hours.