What sun protection factor (SPF) should I choose ?

The choice depends mainly on the intensity of the sun's radiation and your skin type. Indeed, in certain extreme situations, on the beach or in the mountains, it is recommended to choose sun products with a high level of protection (SPF30, SPF50, SPF50+) because of the intensity of the radiation which is combined with high reflection from the sand or snow. This applies to all skin types.

For milky and fair skin, strong and very strong protection (SPF50, SPF50+) is always recommended as well as for skin with imperfections (rosacea, acne, recent scars...) or skin that is very sensitive to sun product radiation.  

In the case of pregnancy, for example, the skin's sensitivity to the sun is increased. To prevent the appearance of brown spots on different areas of the face (melasma or pregnancy mask), a very high protection factor (SPF50+) is then recommended.

As for younger skin, a very high protection factor (SPF50+) should always be chosen. As a reminder, babies and young children under 3 years of age should not be exposed to direct sunlight. Furthermore, they should be protected, even if they are in the shade, with a wide-brimmed hat, glasses and a T-shirt.