The Sun Protection Factor given as a number on the front of a sunscreen product is an indication of the amount of protection a product provides against sunburn, which is mainly caused by UVB rays.
Sunlight is made up of visible light, infra-red light and UV (ultra violet) rays.
The SPF number is an industry initiative that has standardised the way a product's UVB protection is indicated throughout the UK, Europe and much of the rest of the world.
The higher the SPF factor the higher the protection and SPF 15 is a recommended minimum.
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