When hair feels rough, snaps easily, or looks dull and straw-like after too much colour, heat, or weather, a weekly mask is the most effective way to bring it back into line. A mask sits on the hair longer and more richly than an everyday conditioner, giving conditioning ingredients the time they need to soften, smooth, and improve the look and feel of stressed strands. No product truly reverses damage or permanently rebuilds a broken strand, but the right mask makes hair feel stronger, glossier, and far more manageable, and that difference is often dramatic.
Because “repair” means very different things depending on the formula, choosing well matters. Some masks flood hair with moisture, others target the internal structure with bond-building technology, and plenty simply coat the surface for a temporary fix. We judged these on how deeply they condition, how well they suit different hair types, whether they smooth without weighing hair down, and how honestly they describe what they do. From bond-building science to salon classics and clever budget picks, these six are the ones worth building a routine around. Pair a mask with a gentler wash for the best results; our guide to sulfate-free shampoos covers that side.
What to look for
Understand what kind of “repair” you actually need. Bond-building treatments work on the internal structure to help strengthen the appearance and feel of over-processed hair, which suits heavily coloured or bleached heads, while moisture masks focus on softness and smoothness using rich oils and butters, ideal for hair that is simply dry and thirsty. Many people benefit from owning one of each and alternating between them depending on what their hair needs that week.
Match the richness to your hair type. Fine hair wants lighter formulas used a little less often, as heavy masks can leave it flat and lank, while thick, coarse, or curly hair can happily take richer, more emollient treatments and often craves them. Reading the ingredient list helps: proteins and bond-builders lend structure, while oils, butters, and humectants lend softness and slip.
Timing and application matter as much as the product. Read the instructions, as some treatments work in a few minutes, others want ten to twenty, and a couple are applied to dry hair before washing rather than after. Focus product on mid-lengths and ends, where damage concentrates, and avoid overloading the roots. Between masks, a good leave-in conditioner maintains softness day to day, and a finishing hair oil adds the gloss that makes healthy hair look its best.
1. Olaplex No.3 Hair Perfector
A pre-shampoo bond-building treatment applied to damp hair, left on, then washed out before you shampoo and condition as normal. It uses Olaplex’s patented technology to help improve the strength, look, and feel of damaged and over-processed hair, and it has become a firm favourite among colour-treated and bleached heads for good reason. It is a treatment step rather than a conditioner, which trips some people up at first, but once you slot it in ahead of your usual wash it becomes an easy weekly habit that pays off over time.
Why it made the six: It targets the internal structure rather than simply coating the surface, making it a genuinely different kind of treatment from a standard moisture mask.
Price: Premium; widely stocked at LookFantastic and Space NK.
The Sixated take: The go-to for chemically or heat-stressed hair. Use it weekly alongside a moisture mask for the fullest routine.
2. K18 Leave-In Molecular Repair Hair Mask
A quick, leave-in treatment that works in a few minutes to help improve the look, strength, and softness of damaged hair, with no rinsing required afterwards. A small amount goes a long way, and it fits neatly into even the most rushed routine, since you simply apply and carry on styling. The results tend to build noticeably with consistent use over several washes.
Why it made the six: Its speed and leave-in format make it uniquely convenient, and the payoff grows the more consistently you use it.
Price: Premium; available at Sephora UK and Space NK.
The Sixated take: Best for time-poor people who still want serious repair. Follow the timing and quantity instructions precisely for the best effect.
3. Moroccanoil Intense Hydrating Mask
A rich, argan-oil-infused moisture mask that softens and smooths dry, brittle-feeling hair in just a few minutes. It leaves hair notably silkier and much easier to detangle, carrying the brand’s signature amber-vanilla scent that its fans adore. It is a straightforward, dependable hydration boost rather than a structural treatment, and it does that job reliably.
Why it made the six: It is a reliable, fast-acting moisture mask that suits most hair types craving softness and slip without complication.
Price: Upper mid-range; stocked at LookFantastic and salons.
The Sixated take: The everyday hydration hero. Great paired with a bond-builder for a complete, well-rounded routine.
4. Briogeo Don’t Despair, Repair! Deep Conditioning Mask
A nourishing mask built around rich oils and conditioning ingredients that soften and smooth the appearance of dry, damaged-looking hair. It leans clean in its formulation, avoiding a long list of ingredients some prefer to skip, and it works especially well on thicker or curlier textures that need generous moisture. The texture is indulgent without being difficult to rinse.
Why it made the six: It delivers deep moisture with a well-considered ingredient list, making it a strong all-round conditioning treatment.
Price: Premium; available at Space NK and Sephora UK.
The Sixated take: A luxurious weekly treat for dry or textured hair that wants softness and shine in equal measure.
5. Kerastase Resistance Masque Extentioniste
A salon-grade mask aimed at strengthening the appearance of lengths and reducing the look of breakage, leaving hair smoother and more resilient-feeling. It conditions richly while remaining pleasant to apply and easy to rinse, and it carries the polished, indulgent feel you would expect from the brand. It is particularly suited to those trying to grow their hair longer.
Why it made the six: It offers a professional, indulgent conditioning experience with a clear focus on smoother, healthier-looking lengths.
Price: Premium; sold at LookFantastic and salons.
The Sixated take: The salon-in-a-jar option for those growing hair out or battling persistent mid-length dryness.
6. Garnier Ultimate Blends Hair Food 3-in-1 Mask
An affordable, versatile mask that can be used as a rinse-out conditioner, a deep mask, or a leave-in depending on what you need. It softens and smooths with a natural-leaning scent, offering genuine moisture at a price that makes weekly use effortless and guilt-free. The generous tub and flexible format mean very little goes to waste.
Why it made the six: It brings real conditioning value for very little money, making deep conditioning genuinely accessible to everyone.
Price: Budget; a supermarket and Boots staple.
The Sixated take: The best-value entry point. Ideal if you are new to masking and want to build the habit before spending more.
Consistency matters more than any single product: a weekly mask, applied to the ends where damage lives and given the full time to work, does far more than an occasional expensive splurge. Support it by easing off high heat, protecting hair before hot tools, and being gentle when detangling wet hair, since that is when strands are most vulnerable to breaking. If dryness keeps returning between washes, refreshing with a light spray and a good dry shampoo reduces how often you need to wash and, in turn, how much your hair has to recover from. Kind habits and the right mask together are what keep damaged hair looking healthier over time. Be patient, too, since genuinely dry or over-processed hair takes weeks of consistent care to feel and look meaningfully better, and no single treatment works overnight. Choose the mask that matches your hair’s needs, use it faithfully, and pair it with gentler styling, and you will steadily see rougher, duller lengths give way to softer, glossier, more resilient-feeling hair.