Sun protection in the Mediterranean: what to use
For a Mediterranean summer, factor 50 is recommended on the face and exposed areas, applied in sufficient quantity thirty minutes before exposure and renewed every two hours and always after swimming.
gelisted editorial team · Updated 15 August 2026
The short version
- The reference quantity is 2 milligrams per square centimetre of skin.
- An adult body needs about 30 millilitres per full application.
- Factor 50 filters around 98 per cent of ultraviolet B radiation.
- Reapplication is needed every 2 hours and after every swim.
The usual mistake is not the factor chosen. It is the amount applied: with half the product, a factor 50 behaves closer to a 15.
How much product is needed
The protection factor is determined in the laboratory applying 2 milligrams per square centimetre. Translated into practice, an adult needs about 30 millilitres to cover the whole body, roughly a shot glass, and about 2 millilitres for face, neck and ears, about two fingers of product spread along the index fingers. Almost nobody applies that much.
| Item | Figure | Note |
|---|---|---|
| Factor 15 | about 93 % of UVB | insufficient in summer |
| Factor 30 | about 97 % of UVB | daily urban use |
| Factor 50 | about 98 % of UVB | beach and long exposure |
| Reference quantity | 2 mg per cm² | the laboratory figure |
| Whole body | about 30 ml | per application |
| Face, neck and ears | about 2 ml | per application |
| Reapplication | every 2 hours | and after every swim |
| Apply before exposure | 30 minutes | for chemical filters |
Why this coast demands more
Radiation increases through reflection: sand reflects part of the rays and water another, so skin receives direct and reflected radiation at once. The sea breeze lowers the sensation of heat and with it the perception of risk, which extends exposure without warning. And in the central hours, between 12 and 17, the ultraviolet index reaches its daily peak.
The areas people forget
Ears, tops of the feet, the back of the neck, eyelids, lips and the parting line. They account for a notable share of the lesions attributable to accumulated sun and they receive the least product. A lip balm with a factor and a hat solve two of them without relying on memory, and the tops of the feet deserve a specific application on arriving at the beach.
Closely woven clothing protects more than any cream and needs no reapplication, which is particularly useful for children in the central hours.
What sunscreen does not do
It does not allow more hours in the sun. No factor blocks 100 per cent of radiation, and extending exposure because you are wearing cream cancels the protection gained. Nor is a water resistant product waterproof: resistance is measured over 2 or 4 immersions of 20 minutes, after which reapplication is required in any case.
Frequently asked
+What factor should I use at the beach?
Factor 50, applied in sufficient quantity and renewed every two hours and after every swim.
+How much cream is needed?
About 30 millilitres for the whole body and 2 millilitres for face, neck and ears.
+When should it be applied?
Thirty minutes before exposure where the product uses chemical filters.
+Does water resistant mean waterproof?
No. Resistance is measured over two or four immersions of twenty minutes, then reapplication is needed.
+Which areas are most forgotten?
Ears, tops of the feet, the back of the neck, eyelids, lips and the parting line.
Sources
- 1Ministerio de Sanidad, Gobierno de España (August 2026)
- 2Regulation (EC) 1223/2009 on cosmetic products, European Union (August 2026)