What does SPF mean?

SPF stands for Sun Protection Factor. SPF relates to the amount of time it takes for redness to appear on the skin compared to when no product is used at all. The test is done in a laboratory. For example, if it takes 10 minutes for unprotected skin to show redness, then an SPF30 sunscreen correctly applied, in theory, will take 30 times longer or 300 minutes to burn. However, it is hard to achieve this level of protection in real life – factors such as skin type, ultraviolet (UV) levels, swimming/drying and how much sunscreen you apply can affect the level of protection. That's why we always recommend applying liberally every two hours or after swimming, sweating or towel drying. It is also important to apply 20 minutes before being exposed to UV.