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The Sarah K So Liss Complete Progressive Smoothing & BTX Volume Reduction Salon Kit - 2x1000ml + 1kg brings the full So Liss salon system together: the Deep Clean Shampoo for clarifying prep, the Expert Tech Progressive System for progressive keratin smoothing, and the BTX Volume Reduction Mask for volume reduction. One prep step, two finishing routes: after clarifying, a stylist picks progressive smoothing or BTX volume reduction to suit each client. Built on whey protein and keratin, for professional use.
- What it is: the complete So Liss salon system (clarify plus two routes)
- In the kit: Deep Clean Shampoo, Expert Tech Progressive System and BTX Volume Reduction Mask
- Two routes: progressive keratin smoothing (Step 2) or BTX volume reduction (the mask)
- Hero actives: Whey Protein, Keratin and Aloe Vera in the prep shampoo
- Formaldehyde: the mask is labelled 0% formol; the progressive system smooths via glyoxylic acid
- The result: less frizz and volume, a sleeker or softer finish per route
- Format: 2x1000ml + 1kg, professional use
One prep step, two finishing routes
The Deep Clean Shampoo clarifies so the hair is ready for the route that follows. The Expert Tech Progressive System delivers progressive keratin smoothing, aligning the hair for less frizz and a sleeker finish; the BTX Volume Reduction Mask reduces bulk and frizz for a softer, more manageable result. A stylist picks one route per client, to suit the look.
What is in the kit
- So Liss Deep Clean Shampoo (1000ml): a clarifying shampoo with Aloe Vera that preps the hair.
- So Liss Expert Tech Progressive System (1000ml): the progressive keratin smoothing step, with the Brazilian Protein seal, for a sleeker finish.
- So Liss BTX Volume Reduction Mask (1kg): the formaldehyde-free BTX route that reduces volume and frizz for a softer result.
Key ingredients
- Whey protein and keratin: the proteins shared by the smoothing system and BTX mask, for support on either route.
- Glyoxylic-acid progressive system: the Expert Tech route that aligns the hair for less frizz, without formaldehyde.
- Formaldehyde-free BTX complex (0% formol): the mask's acid-based route that tames frizz.
- Aloe Vera (in the Deep Clean Shampoo): the clarifying prep for both routes.
What to expect
Hair looks smoother and more polished and styling is faster, depending on the route. Either way, frizz and volume are reduced, the hair is easier to manage, and the effect eases off gradually rather than all at once.
Who it is for
- Salons that want the complete So Liss system, both routes on hand for different clients.
- Stylists offering both smoothing and BTX volume reduction from one kit.
- Most hair types, including colored or lightened hair after a strand test.
Who it is not for
- At-home users; this is a professional system with flat-iron work best done by a stylist.
- Anyone expecting one product to do everything; each service uses one route.
- Anyone who has not done a patch test and strand test first.
Professional tip
Decide the route before you start, based on the client's hair and the look they want. Clarify thoroughly with the Deep Clean Shampoo first either way, apply evenly from roots to ends, and flat-iron in slow, even passes. On blonde, red or lightened hair, keep the iron at the lower end of the range.
How to use
- Patch-test 48 hours before, and strand-test on colored or lightened hair.
- Prep (both routes): wash with the Deep Clean Shampoo to clarify; on the final wash leave about 3 minutes, then rinse.
- Progressive smoothing route: blow-dry, section, apply the Expert Tech Progressive System off the roots to the ends, comb, leave about 40 minutes, rinse, apply the neutralizing step, then flat-iron at 190 to 230°C in slow passes (maximum 190°C on lightened hair); wait 24 to 48 hours before washing.
- BTX volume-reduction route: towel-dry, section, apply the BTX Volume Reduction Mask roots to ends, comb, leave 40 to 60 minutes, rinse with water only, then flat-iron at 190 to 230°C (lower end on lightened hair).
Compatibility
The kit is the complete So Liss salon system on its own, covering both routes from a single clarifying prep. For a single route, the So Liss Progressive Keratin Kit pairs the shampoo with the Expert Tech Progressive System, and the So Liss Deep Clean Shampoo & BTX Mask Kit pairs it with the mask. Afterwards, a gentle, color-safe home-care routine helps either result last.
In short
- The complete So Liss salon system: Deep Clean Shampoo, Expert Tech Progressive System and BTX Volume Reduction Mask.
- One prep step, two finishing routes: progressive keratin smoothing or BTX volume reduction.
- Built on whey protein and keratin; the mask is 0% formol, the smoothing system via glyoxylic acid.
- 2x1000ml + 1kg, professional use; not vegan.
Complete your So Liss system
- Sarah K So Liss Deep Clean Shampoo - Step 1 - Aloe Vera - 1000ml -- the clarifying prep step, also available on its own.
- Sarah K So Liss Expert Tech Progressive System - Step 2 - Brazilian Keratin - 1000ml -- the progressive keratin smoothing route, for re-ordering.
- Sarah K So Liss BTX Volume Reduction Mask - Formaldehyde-Free - 1kg -- the formaldehyde-free BTX volume-reduction route, for re-ordering.
- Sarah K So Liss Progressive Keratin Kit - Step 1 & 2 - 2x1000ml -- the two-step progressive kit, prep plus smoothing.
Frequently asked questions
Is the kit formaldehyde-free, and how do I use it safely?
The BTX Volume Reduction Mask is labelled 0% formol and can be described as 'formaldehyde-free'. The Expert Tech Progressive System smooths through a glyoxylic-acid process and lists no formaldehyde in its ingredients, though it is not itself labelled formaldehyde-free. The mask contains methylisothiazolinone and methylchloroisothiazolinone, so patch-test 48 hours before and work in a ventilated space with gloves.
What is in the kit, and how do the two routes work?
The kit holds three products: the Deep Clean Shampoo (1000ml), the Expert Tech Progressive System (1000ml) and the BTX Volume Reduction Mask (1kg). The shampoo clarifies, then you choose one finishing route per client: progressive keratin smoothing with the Expert Tech system, or BTX volume reduction with the mask. Both start from the clarified base.
Can I use it on colored or bleached hair?
Both routes are generally used on colored and bleached hair, but porosity varies, so a strand test first is essential. On the progressive smoothing route, keep the flat iron to a maximum of 190 degrees on blonde, red or lightened hair; on the BTX route, stay at the lower end of the range. A slight change in tone is possible.
How long do the results last?
Both finishes ease off gradually rather than dropping all at once. Progressive smoothing relaxes as the hair grows and is washed; the BTX volume reduction softens over time. How long either lasts depends on hair type, wash frequency and aftercare, and a gentle, color-safe home-care routine helps them last longer.
What is the difference between progressive smoothing and BTX volume reduction?
Progressive keratin smoothing, with the Expert Tech system, aligns the hair for less frizz and a sleeker finish. BTX volume reduction, sometimes called hair botox, uses the mask to reduce bulk and frizz for a softer result while keeping movement. Both are built on whey protein and keratin, so neither is vegan; the choice depends on whether the client wants a sleeker or a softer, less voluminous finish.
Can I do this at home, or is it salon-only?
It is labelled for professional use, and the method is what makes the difference. Each route is clarified, applied evenly, left to develop, rinsed and then dried and flat-ironed in slow, even passes at the right temperature. A stylist manages the route choice, the timing and the heat, which keeps the result even and long-lasting.
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Sarah K So Liss Complete Progressive Smoothing & BTX Volume Reduction Salon Kit - 2x1000ml + 1kg
The complete So Liss salon system in one box: clarify with the Deep Clean Shampoo, then finish with progressive keratin smoothing or BTX volume reduction. Both routes, one kit.
