Usually, after-sun should be applied daily – generally after a bath or shower (or, in the case of Vichy Ideal Soleil After Sun, you can actually use it in the shower). It should make your skin feel instantly soft and hydrated. How much do I need to spend? Yes, provided you buy a formula that’s designed specifically for that type of skin. Ladival DNA After Repair Sun Gel and La Roche-Posay Posthelios Gel (reviewed below) are both specifcally designed for sensitive skin. How often should after-sun be applied? All good after-suns prolong a tan, but this one adds to it so you can come home from your holiday looking even more sun-kissed. There are other formulations available that include fake tan, but this gives a natural-looking glow, without streaking. Plus, it does everything a good after-sun product should do, too – you’ll feel it hydrating your skin the moment you apply it. But don’t forget to wash your hands after use – and wait a few minutes before putting on your clothes (especially those white jeans).