Why the sun is your hair's greatest enemy and how the Kérastase Soleil line protects you from your first dip to your last hour at the beach.
The sun is wonderful. For your hair, not so much.
There is something irresistible about long summer days in Portugal—the bright sun, the cold Atlantic water, the hot sand under your feet. But while your skin still remembers the sunscreen you applied in the morning, your hair faces hours of exposure without any shield.
And the result? Dull, parched, brittle strands. Color that fades sooner than expected. Frizz that no styling product can tame. If you have ever reached the end of summer with hair that feels like straw, you know exactly what we are talking about.
The good news is that there is a solution designed specifically for this: the Kérastase Soleil range, available at Hairstylist. With over 25 years of expertise in sun protection for hair, this line is the ritual your hair needs before, during, and after sun exposure.
What the sun actually does to your hair
To understand why sun protection for hair is so important, it helps to understand what happens when hair is exposed to UV radiation without protection.
Keratin, the protein that gives hair its structure, is directly attacked by UVA and UVB rays. Over time, this degradation makes strands fragile, porous, and prone to breakage. The sun also removes the hair's natural moisture, leaving it dry and lackluster. This effect is amplified when combined with saltwater from the ocean or chlorine from pools, which penetrate the cuticle and strip away the natural lipids of the hair fiber.
For those with colored, dyed, or bleached hair, the situation is even more critical. Solar radiation accelerates pigment fading, and what cost time and money at the salon can be lost in just a few weeks of summer without proper care.
Not forgetting the scalp: just like the skin on your face, the scalp also suffers from prolonged sun exposure, which can cause discomfort, flaking, and increased sensitivity.
The Kérastase Soleil line was developed precisely to combat all these issues, with a formula that combines a UV filter, vitamin E, and coconut water—three ingredients that work together to protect, nourish, and recover sun-exposed hair.
The ingredients that make the difference
One of the secrets to the success of the Soleil range lies in the selection of active ingredients that make up its formulas. Coconut water penetrates deep into the hair fiber, providing hydration that goes beyond the surface. It doesn't just coat the strands—it genuinely nourishes them from within.
Vitamin E acts as a powerful antioxidant, neutralizing free radicals generated by sun exposure and preventing the degradation of hair proteins. It also helps retain nutrients in the fiber, reduces breakage, and leaves hair softer and shinier.
The UV filter absorbs sun rays before they can cause structural damage, acting as a sunscreen specifically formulated for hair. The result is an invisible shield that stays with your hair throughout the day.
Added to all this is an exclusive summer fragrance, with notes of jasmine and tuberose, which transforms the hair care ritual into a truly sensory experience.
The products in the range and how to use them
The beauty of the Kérastase Soleil range lies in how each product was designed for a specific time of day—before leaving home, during beach or pool hours, and at the time of post-sun cleansing. Together, they form a complete routine that covers all your hair's needs in the summer.
The Bain Après-Soleil is the starting point of the cleansing routine. This post-sun shampoo has a translucent gel texture that gently removes residues of chlorine, salt, and sand that accumulate throughout the day, without being harsh on already sensitized hair. Its formula, enriched with coconut water, purifies the scalp and lengths, leaving the strands refreshed, hydrated, and with immediate shine. The summer fragrance lingers for several hours, making washing a genuinely pleasurable experience. It is recommended to wash twice with this shampoo before applying the mask to ensure that all residues are removed and that the hair fiber is prepared to absorb the nutrients from the next step.
The Masque Après-Soleil is the intensive treatment that hair needs after a day of exposure. With a light gel-cream texture, this mask deeply hydrates the strands, replenishes lost nutrients, disciplines frizz, and restores the shine that the sun tends to steal. It does not weigh hair down or leave residue—only a softness that can be felt from root to tip. Its antioxidant elements help balance the aggressive effects of the sun, wind, and saltwater. It is applied after shampooing, to the lengths and ends, and left on for a few minutes before rinsing.
For days when protection starts before you even put on your flip-flops, the Crème UV Sublime is the right product. This leave-in, with an ultra-light texture, is applied to dry or damp hair and offers prolonged protection against humidity and UV radiation. It prevents dryness, controls frizz for up to 24 hours, and leaves hair with a soft, silky finish. The non-oily texture allows for reapplication throughout the day whenever necessary—when your hair gets wet again in the sea or pool, simply reapply after drying slightly. It is especially recommended for thicker hair or hair prone to frizz, also acting as a protector that prolongs color vibrancy in dyed hair.
The Huile Sirène is perhaps the most versatile product in the range and the favorite of those who want that perfectly styled beach hair effect. It is a biphasic leave-in spray—part oil, part styling solution—that defines and enhances natural waves while protecting and nourishing the strands. Developed with babassu oil and a UV filter, it offers texture and definition without the stiff effect of a common salt spray. It is ideal for fine or wavy hair that wants to make the most of summer with style. Shake well before use and apply to the lengths to create instant beach waves full of movement and shine.
How to build your step-by-step summer routine
To get the most out of the Kérastase Soleil range, it is best to follow a routine that covers the three key moments: preparation before exposure, protection during the day, and treatment at the end of the day.
In the morning, before you leave, apply Crème UV Sublime to the lengths and ends of dry or slightly damp hair. If you want to define waves or create a more textured effect, Huile Sirène can be used right after, by shaking the bottle well and applying it to the lengths with your fingers or a diffuser.
During the day, if your hair gets wet repeatedly from sea or pool water, reapplying Crème UV Sublime after the hair dries slightly helps maintain active protection and control frizz caused by humidity.
At the end of the day, when it is time to wash your hair, Bain Après-Soleil does two jobs at the same time: it removes residues accumulated throughout the day and begins the rehydration process. Washing twice ensures a more thorough clean. Next, Masque Après-Soleil does the intensive recovery work, returning nutrition, softness, and shine to sensitized strands.
This routine doesn't just have to be practiced during vacation weeks. In Portugal, with intense sun for much of the year—and especially in the Algarve, Alentejo, and the islands—maintaining a sun protection routine for hair during the warmer months is a smart way to preserve the health and beauty of your hair throughout the entire season.
Who is the Soleil range for?
One of the great advantages of the Kérastase Soleil range is that it has been formulated for all hair types. Whether your hair is straight, wavy, curly, natural, dyed, bleached, or subjected to chemical treatments—the Soleil line adapts to your needs.
For those with colored hair, UV protection is especially important because it prolongs color vibrancy and prevents premature fading. For those with hair that has undergone straightening or keratin treatments, sun protection helps maintain the results for longer, since the sun and humidity are two of the main factors that shorten the durability of these treatments.
For naturally dry or damaged hair, the nourishing active ingredients in the range—coconut water, vitamin E, and babassu oil—offer hydration that goes beyond sun protection, visibly recovering the hair fiber from the very first uses.
The difference you can feel and see
Taking care of your hair in the summer is not a luxury—it's a necessity. Just as you use sunscreen on your skin, your hair deserves the same attention and care. The Kérastase Soleil range, available at Hairstylist, offers you all the products you need to enjoy a full summer without compromising the health and beauty of your hair.
With a simple routine and products developed with high-level hair protection technology, reaching the end of summer with hair as beautiful as it was at the beginning is no longer a difficult goal—it becomes the natural consequence of a good care ritual.
Explore the entire Kérastase Soleil collection at Hairstylist and discover the right combination for your hair type. Summer is coming—and your hair can already be prepared.
