Repairing summer-damaged hair takes about four weeks: one week to clear the decks and take stock, two weeks of intensive protein supply, one week of consolidation. UV, salt and chlorine have done the same thing to your hair by three different routes: they have opened the cuticle and depleted the keratin in the cortex. Repair therefore means rebuilding the structure and rehydrating, not just nourishing.
What summer did to your hair
| Aggressor | Mechanism | What you notice |
|---|---|---|
| UV | Degrade keratin, oxidise protective lipids and melanin | Washed-out tones, dry texture |
| Sea salt | Hygroscopic: it draws water out of the fibre, and its crystals lift the scales as hair dries | Rough feel, tangles |
| Chlorine | A powerful oxidiser: dissolves the hydrolipidic film and alters keratin | Squeaky hair, blonde hair turning colour |
| Wind and friction | Mechanical erosion of the cuticle | Frizz, split ends |
The shared outcome: a porous, open fibre, exactly the state described in the 10 signs of damaged hair.
Week 1: clear the decks and take stock
You do not repair on dirty foundations. Residues of salt, chlorine, sunscreen and styling products stop any treatment from penetrating.
- Two careful washes with a gentle shampoo, such as the /RESET Shampoo, to start again on a clean fibre.
- Elasticity test: a wet hair pulled taut should spring back, not snap.
- Porosity test: the full method is in our dedicated article.
- Inspect the ends in good light. If splits are widespread, book a micro-trim of one to two centimetres. It is the one form of damage that products cannot reverse.
- First /REPAIR Mask at the end of the week.
Weeks 2 and 3: the intensive phase
This is the heart of the protocol. The fibre receives a double supply: protein to rebuild the structure degraded by UV and chlorine, and moisture to make up for what the salt drew out.
- Mask twice a week, 5 to 10 minutes on towel-dried hair. The full method is in our article on processing time.
- Conditioner at every other wash, on lengths and ends.
- Leave-in every time before drying.
- A heat truce: no irons, hairdryer on moderate heat, loose hairstyles without tight hair ties.
Hydrolysed keratin plays the lead role here: it penetrates the porous fibre and fills the gaps, while shea butter and vitamin E restore the oxidised protective film. Every assault avoided during this phase speeds up the result noticeably.
Week 4: consolidate and bring shine back
By this point the feel has already changed: suppler lengths, easier detangling, breakage clearly down. Shine always comes back last, because it depends on a perfectly smooth cuticle.
- Move to one mask a week.
- End every shower with a cool-water rinse, which tightens the scales.
- Apply the /REVEAL Shine Mist to damp hair, then as a light veil on dry hair.
If your hair was very damaged to start with, keep the /REPAIR + /REVEAL Repair Duo going for the following two months: weekly deep repair, daily protection.
Avoiding a repeat next summer
- Wet your hair before diving in. Hair already saturated with fresh water absorbs far less salt and chlorine.
- Rinse after every swim, without fail, even without shampoo. Never let salt dry in the sun on the fibre.
- Protect physically. A hat or scarf during the hottest hours, a loose braid against the wind.
- Keep the care going. It is in summer, not winter, that the weekly mask and daily leave-in are most useful.
Once the fibre is back up to standard, the rest happens beyond the lengths: scalp, cut and organising your routine are covered in our September reset plan in 5 steps.
Post-summer repair: the essentials
- Four weeks is enough for a clear change, two to three months for a fully restored fibre.
- Clear the decks before repairing: residue blocks the actives from penetrating.
- Protein and moisture: summer destroyed both.
- Softness comes back first, shine last.
- Split ends get cut, they are never repaired.
Frequently asked questions about post-summer repair
How long does it take to repair hair after summer?
Four weeks of a consistent protocol produce a clear change, and two to three months are needed for the most exposed lengths to regain their full strength.
Should you cut your hair after summer?
A micro-trim of one to two centimetres is recommended if the ends are split, because a split travels up the fibre. There is no need, though, to sacrifice whole lengths.
Is chlorine worse than seawater?
They damage differently: chlorine oxidises keratin and dissolves the protective film, salt dehydrates and lifts the scales. Chlorine is generally more aggressive chemically, especially on coloured hair.
My hair lightened in the sun, is that serious?
That lightening is natural bleaching: UV has oxidised the melanin. It is not dangerous, but it is a sign that the fibre took a heavy dose of UV and that its keratin was put under strain.
Can I colour my hair as soon as the holidays end?
Better to wait three to four weeks of repair care. On a porous fibre, pigment takes unevenly and bleeds out fast.
Is conditioner enough to repair summer damage?
No: it acts on the surface, whereas summer damage affects the internal structure. It remains essential day to day, but it is the keratin-concentrated mask that does the repairing.
Sources
- Gavazzoni Dias M. F. R., "Hair Cosmetics: An Overview", International Journal of Trichology, 2015.
- Robbins C. R., Chemical and Physical Behavior of Human Hair, 5th edition, Springer, 2012.
Article written by the KERA NEXT editorial team. Individual results: the outcome may vary depending on the nature and condition of your hair.