Our team recommends using the INNISFREE Vita C Spot Tone Up Sunscreen SPF50+/PA++++ as follows: Apply a sufficient amount of the product to your face and neck as the last step of your skincare routine, just before sun exposure. Spread evenly for optimal protection. Reapply every two hours to maintain effective protection, especially after swimming, sweating, or towel drying. Avoid contact with the eyes.