Frizz has a way of showing up uninvited — usually the moment you step outside, straight into the humidity. This is the L'Oréal Professionnel Série Expert Keratin Alpha Sleek Mask 250ml: a rich, five-minute smoothing treatment that talks unruly hair down from the ledge and sends it back out glossy, soft and firmly in control.
TL;DR: A deeply nourishing professional hair mask powered by Keratin-Alpha Shaper and amino-acid chains that reshapes and smooths the hair fibre in just five minutes — taming frizz, calming volume and delivering instant softness and shine. Suitable for all hair types (colour-treated and keratin-treated included), and the smoothing MVP of the wider Keratin Alpha Sleek routine.
Product Details and Benefits
- Keratin-Alpha Shaper + amino-acid chains: works at the hair's Keratin Alpha level to reshape and smooth the fibre from within, rather than just coating the surface.
- Instant frizz and volume control: a rich, sensorial cream texture nourishes deeply while calming flyaways and taming unwanted body.
- Softness, hydration and shine: leaves hair feeling noticeably softer and looking glossier from the very first use.
- A five-minute treatment: fast-acting, so it slots into a normal wash day without hijacking your whole evening.
- Suitable for all hair types: including colour-treated and keratin-treated hair.
- Clean-feeling formula: free from artificial colourants and alcohol, with a fresh, powdery floral fragrance.
- Built for the full routine: pairs with the Keratin Alpha Sleek Shampoo, Smooth Transformer and Serum (each sold separately) to lock in up to 2 weeks of smooth, frizz and volume control.*
How to Use
- Shampoo first — ideally with the Keratin Alpha Sleek Shampoo — then gently squeeze out the excess water.
- Apply the mask evenly from mid-lengths to tips, where frizz likes to stage its rebellion.
- Leave it to work for five minutes.
- Rinse thoroughly, then dry and style as usual for a sleeker, softer finish.
For longer-lasting smoothness, use the Smooth Transformer once a week and this mask on your other wash days.
Pro tip: Comb the mask through with a wide-tooth comb, then let your shower's steam do the heavy lifting during those five minutes — the warmth helps the smoothing formula settle deeper into the fibre before you rinse.
Why You'll Love It
Because it turns "why won't my hair behave" into "wait, is that a fresh blow-dry?" in five low-effort minutes. Add the Keratin Alpha Sleek Mask to your cart and let frizz know its reign is over.
