Greater attention should be given to fair skin that sunburns easily. The time of day must also be considered: you caution is called for between 11 a.m. and 4.p.m. It is essential to reapply sun protection products every two hours and they must also be applied in sufficient quantities.
Now we have simplified the labels which mention four categories of protection. Low, Moderate, High, Very High. I only recommend the last two categories. It is necessary to use a broad spectrum covering UVB rays (responsible for sunburns) and UVA rays (which accelerate ageing). Finally, you have to choose the galenic form (cream, fluid cream, gel, etc.) that is best suited to the areas in question and the patient's preferences.
For clothing, you should opt for tightly woven fibres and fabrics in dark colours. For protection products, go for High and Very High protection reapplied regularly. Sunglasses must have CE approval in category 3 and 4. Other characteristics of sun protection products include: good tolerance, photostability, water resistance and perspiration resistance. To ensure they are used properly, products must be pleasant and practical.