It is often a product people buy twice: once to do the right thing, and a second time because the texture of the first did not suit and the tube stayed shut.
Better to start from the right criteria.
In short
A good face sunscreen is first and foremost the one you apply every morning: the finish and texture matter as much as the rating. For the face, an SPF 50 carrying the UVA-in-a-circle logo is the sensible default, applied generously. Reapply every two hours when you are exposed, and after swimming or sweating.
The only criterion that really matters: wearing it
A sunscreen that stays in the cupboard protects you from zero per cent of UV, whatever its rating. Before comparing filters, the useful question is: will I put it on every morning?
That depends on three very practical things:
- the finish: matte, satin or dewy, depending on what you can stand at the end of the day;
- the white cast: more common with mineral filters, and particularly visible on darker skin;
- compatibility with make-up: some formulas pill under foundation.
These three points matter more than the gap between two neighbouring ratings.
SPF 30 or SPF 50?
The rating measures protection against UVB under laboratory conditions, with a much larger amount applied than in everyday life.
In practice, since almost nobody applies the tested amount, choosing SPF 50 brings you closer to decent real-world protection despite under-application. It is the sensible default for the face.
The rating says nothing about UVA, the rays that penetrate deepest. In Europe, the UVA-in-a-circle logo on the packaging, which comes from a European Commission recommendation, indicates UVA protection proportionate to the SPF rating. That logo is what to look for, more than the number.
Mineral or chemical filters?
Both protect. The choice is about comfort, not effectiveness.
| Mineral (zinc oxide, titanium dioxide) | Chemical (organic) | |
|---|---|---|
| Finish | Often more opaque, white cast possible | More transparent |
| Feel | Thicker | More fluid |
| Sensations | Generally well tolerated by reactive skin | Varies by formula |
Many products combine both families. A “mineral” label is not in itself a guarantee of better tolerance: a poorly tolerated mineral formula exists too.
The amount, the real weak spot
This is where most of the advertised protection is lost. The usual guide for the face alone is about two fingers of product, which means a line of product along your index and middle fingers.
That is noticeably more than most people apply. If the amount seems excessive, you were probably using too little until now.
Don’t forget the areas that get skipped without thinking: ears, jawline, neck, backs of the hands.
Should you reapply during the day?
It depends on exposure, not on the time:
- a day indoors, away from a window: one application in the morning is generally enough;
- time outdoors, commuting, a café terrace: reapply every two hours;
- swimming or sweating: after every towel-dry, even with a water-resistant formula.
Over make-up, an SPF stick or mist lets you top up without ruining everything. And before travelling with your routine, count those reapplications: they quickly double the amount you need to pack. On a ski holiday, where snow reflects some of the UV, they matter even more: the mountain routine is in sunscreen for skiing and the mountains.
What doesn’t matter
- The price. The European requirements for ratings are the same for everyone.
- The date of the collection. A newer formula is not automatically better.
- The “special oily skin” claim. It describes a texture, not the protection.
And if you are wondering whether it is still worth it once summer is over, the answer deserves an article of its own: SPF in September, at the office and behind a window.
Finally, if you are under dermatological care or taking a photosensitising medicine, advice on sun exposure comes from your doctor, not from a blog article.
Sunscreen is the last step of the morning: its exact place in the sequence is detailed in the order to apply your products, and its role in a short routine in the minimalist 4-step routine.
Frequently asked questions
SPF 30 or SPF 50 for the face?
Since almost nobody applies the amount tested in the laboratory, SPF 50 is the sensible default for the face. Dermato-info points out that many people apply only half of it, which greatly reduces real-world protection.
What does the UVA-in-a-circle logo mean?
According to Dermato-info, a product displaying this logo must offer sufficient UVA protection relative to its SPF. The SPF rating itself mainly measures protection against UVB.
Should you reapply sunscreen during the day?
Yes, as soon as you are outdoors: the Société Française de Dermatologie recommends reapplying every two hours, and after every swim, heavy sweating or towelling off. A day indoors away from windows generally needs just one application in the morning.
Do mineral filters protect better?
No: mineral and chemical filters both protect. The choice is made on comfort (finish, white cast, feel), and a “mineral” label alone does not guarantee better tolerance.