Make 15 your lucky number. Skip the lotions that only provide partial sun protection. SPF 15 is the first stop for real skin protection. Remember snow- and sandburn. Don't kiss off protection.
Lips are skin.
Use a lip balm with an SPF of 15 or greater every day. Keep the sunscreen flowing. Waterproof sunscreen will wear off and wipe off on a towel. Reapply protection frequently, especially when at the beach. Maintain your commitment .