Visit to explore a world of beauty

  • Exclusive to the site: Beauty advice from our experts
  • The beauty secrets of the stars: Your stars show you their favourite looks
  • Sign up to Beauty Confidential to receive personalised diagnostics and advice, as well as exclusive advantages such as advanced product previews and competitions.

SPF, UVA and UVB Explained


The sun protection factor (SPF) of a sun protection product is a measure of a product's ability to protect your skin during sun exposure. The number used is determined by an international standardised and calculated test method.

The sun protection factor identifies how much a sunscreen protects the skin in the sun without burning. Hence, a higher protection factor will give better protection provided sufficient product is applied regularly. Using a higher SPF is designed to increase your level of protection, not the amount of time you can spend in the sun. Don't forget that different people respond to sun exposure in different ways - those with fair skin need higher protection than those with dark skin. Also your reaction to the sun will depend on the time of day, year, geographical location, which activities you are involved in etc.

UVA and UVB Rays

Ultra-violet radiation (UVA + UVB) is the invisible killer that you can't see or feel and can be high even on cool and overcast days. Daily UVA + UVB protection is essential all year round.

What is the difference between UVA and UVB rays?

UVA rays accelerate skin ageing by damaging the skin structure. UVB rays cause burns and superficial damage to the skin.

According to dermatologists, 80% of premature skin ageing is due to UVA exposure. You can use UV Perfect as a standalone moisturiser or as a base under your anti-ageing skincare.


If you are already registered, log in the field below:


Please cancel my subscription to Beauty Confidential

Forgot your password?

Veuillez entrer votre adresse e-mail ci-dessous et nous vous enverrons votre mot de passe.


Send to a friend

Email addresses supplied are used solely to send the requested article and are not kept afterwards.


Subscribe to the newsletter

Inscrivez-vous pour recevoir la newsletter de l'Oréal Paris : bourrée d'infos sur les tendances de la saison et les nouveaux produits dont on parle, avec en bonus des offres spéciales, des promotions beauté, des conseils d'expert et plein d'autres surprises !

Sign me up

If you wish to unsubscribe from L'Oréal Paris, please click here.

For any questions or more information about our products why not contact one of our relevant consumer advisors?