The sun and your hair: invisible damage and how to protect yourself
We apply sunscreen to our skin before going out in the sun. We seek shade during the most intense hours. And we wear sunglasses to protect ourselves from UV rays. But hair, which is also exposed and suffers the consequences, rarely receives the same attention.
How UV rays affect hair
Ultraviolet radiation acts on hair on two levels. On one hand, it degrades melanin—the pigment that gives hair its color—causing discoloration, loss of tone, and those unwanted orange or yellowish highlights. On the other, it deteriorates the keratin and lipids in the hair cuticle, which results in hair that is dry, porous, dull, and more prone to breakage.
Who is most vulnerable to solar hair damage?
Although all hair types can be affected by solar radiation, the most vulnerable are:
- Bleached hair or hair with previous chemical treatments, whose cuticles are already more open
- Very porous or dry hair, which absorbs UV damage more easily
- Fine hair, which has less mass to distribute the impact of the radiation
UV hair protection: what to look for in a product
A good hair sunscreen is not simply a product that lists UV filters among its ingredients. It must form an actual protective film over the cuticle, be light enough not to weigh the hair down, and, if possible, provide additional benefits such as hydration or shine.
Habits to protect your hair from the sun this summer
- Apply a hair protector with a UV filter before going out, especially in summer
- Wear a hat or headscarf during hours of peak radiation (12 PM–4 PM)
- Hydrate your hair more frequently during months of intense sun exposure
- Avoid letting your hair dry in the sun without prior protection; the sun's heat combined with the lack of a shield is the worst combination for the hair fiber
Frequently asked questions about hair sun protection
Does the sun damage hair the same way it damages skin?
Not exactly, but it does damage it. In hair, UV rays act mainly on melanin and keratin, causing discoloration and loss of strength. There is no risk of hair cancer, but the structural damage is real and cumulative.
Does dark hair also need UV protection?
Yes. Although dark hair has more melanin and is somewhat more resistant to discoloration, the keratin and cuticle are damaged equally by prolonged sun exposure.
Can I use the same skin sunscreen on my hair?
It is not recommended. Skin sunscreens are not formulated for hair fibers and can leave heavy residue behind. Ideally, you should use a product specifically formulated for hair.
Caring for your hair against the sun is not a luxury; it is part of any complete hair care routine. And the good news is that it doesn't have to be complicated. A single, well-formulated product, applied before going out, is enough to make a difference.
