Sun Protection Factor (SPF) is the index that indicates the amount of time it will take UVB rays to penetrate and redden the skin when using sunscreen, compared to how long it would take to redden without using protection. For example, a product with SPF 30 means that it will take 30 times longer to redden the skin when using the product, compared to not applying sunscreen at all.

Which SPF factor you should use for your skin is dependent on your age and your skin type. Complete our SPF guide below to see which SPF factor you are recommended to use.

SPF is only an indicator about a sunscreen's efficacy against UVB rays to stop you from burning, therefore you should always use a broad spectrum sunscreen product that protects you from UVA as well as it can cause long term damage to your skin. The EU recommendation therefore states that UVA protection should be at least one third of the labelled SPF, so you should always buy sunscreen that has the UVA symbol on back of pack.