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The Sarah K So Liss Deep Clean Shampoo & BTX Volume Reduction Mask Kit - 1000ml + 1kg pairs the two salon products behind So Liss BTX volume reduction: the Deep Clean Shampoo that clarifies and preps the hair, and the BTX Volume Reduction Mask that reduces bulk and frizz. Built on whey protein and keratin and labelled 0% formol, the mask works on clean hair to tame volume, soften the surface and leave hair smoother and easier to manage, with natural movement.
- What it is: the complete two-step BTX volume-reduction kit (clarify plus volume reduction)
- In the kit: Deep Clean Shampoo 1000ml and BTX Volume Reduction Mask 1kg
- Reduces volume with: whey protein, keratin and a formaldehyde-free BTX complex
- Hero actives: Whey Protein, Keratin and Aloe Vera in the prep shampoo
- Formaldehyde: the mask is labelled 0% formol / 'formaldehyde-free'
- The result: less volume and frizz, a softer, smoother, more manageable finish
- Format: 1000ml + 1kg, professional use
A complete two-step BTX volume-reduction system
This kit is a BTX volume reduction rather than a straightener, and it works in two steps. The Deep Clean Shampoo clarifies so nothing sits between the fibre and the mask. The BTX Volume Reduction Mask is then applied to the clean hair, left to develop, rinsed and set with heat: its whey protein and keratin, in a formaldehyde-free BTX complex, help reduce bulk and tame frizz so the hair sits smoother. It reduces volume and smooths rather than straightening.
What is in the kit
- So Liss Deep Clean Shampoo (1000ml): a clarifying shampoo with Aloe Vera that preps the hair, so the mask meets a clean, even surface.
- So Liss BTX Volume Reduction Mask (1kg): the formaldehyde-free BTX treatment that reduces volume and frizz, worked through and set with heat for a softer, smoother finish.
Key ingredients
- Whey protein and keratin: the proteins at the heart of the BTX mask, helping support the fibre as volume is reduced.
- Formaldehyde-free BTX complex (0% formol): the acid-based volume-reduction system that tames frizz without formaldehyde.
- Aloe Vera (in the Deep Clean Shampoo): a soothing balance for the clarifying prep.
- Conditioning agents: soften the surface and add a healthy-looking shine to the finish.
What to expect
Hair looks smoother and more polished, volume and frizz are noticeably reduced and styling is faster. Expect softer, more manageable hair rather than a poker-straight finish: bulk settles and frizz eases. The result eases off gradually rather than dropping all at once.
Who it is for
- Stylists who want the complete clarify-and-BTX volume-reduction kit in one box.
- Clients wanting less volume and frizz and softer, more manageable hair without a straightener.
- Most hair types, including colored or lightened hair after a strand test.
Who it is not for
- Anyone expecting a permanent, poker-straight result; this reduces volume rather than straightens.
- At-home users wanting a quick wash-in product; this is a professional applied service with a flat-iron pass.
- Anyone who has not done a patch test and strand test, which come first.
Professional tip
Clarify thoroughly with the Deep Clean Shampoo before the mask, so the BTX Volume Reduction Mask meets a clean, even surface. Apply evenly in sections from roots to ends, respect the development time, 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 the service, and strand-test on colored or lightened hair.
- Wash with the Deep Clean Shampoo to clarify the hair; on the final wash leave about 3 minutes, then rinse and towel-dry.
- Section the hair into four. Apply the BTX Volume Reduction Mask from roots to ends, combing through so every strand is coated.
- Leave to develop for 40 to 60 minutes.
- Rinse with water only (no shampoo), then blow-dry the hair fully.
- Flat-iron in slow, even passes at 190 to 230°C; keep to the lower end on blonde, red or lightened hair.
Compatibility
The kit is the complete clarify-and-reduce service on its own: clarify with the Deep Clean Shampoo, then reduce volume with the BTX Volume Reduction Mask on the clean lengths. For a progressive keratin smoothing instead, the So Liss Expert Tech Progressive System offers that route; the complete So Liss Salon Kit brings all three together. Afterwards, a gentle, color-safe home-care routine helps the result last.
In short
- A professional two-step kit that pairs the Deep Clean Shampoo clarifier with the formaldehyde-free BTX Volume Reduction Mask.
- Built on whey protein and keratin; the mask is labelled 0% formol.
- Less volume and frizz, a softer, smoother, more manageable finish, while keeping natural movement.
- 1000ml + 1kg, professional use; a BTX volume reduction, not a permanent straightener.
Complete your So Liss system
- Sarah K So Liss Deep Clean Shampoo - Step 1 - Aloe Vera - 1000ml -- the clarifying prep, also available on its own.
- Sarah K So Liss BTX Volume Reduction Mask - Formaldehyde-Free - 1kg -- the formaldehyde-free BTX volume-reduction mask, for re-ordering.
- Sarah K So Liss Expert Tech Progressive System - Step 2 - Brazilian Keratin - 1000ml -- the progressive keratin smoothing route.
- Sarah K So Liss Complete Progressive Smoothing & BTX Volume Reduction Salon Kit - 2x1000ml + 1kg -- all three products in one complete salon kit.
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 'formaldehyde-free', so this kit reduces volume and frizz without formaldehyde. The mask does contain the preservatives methylisothiazolinone and methylchloroisothiazolinone, so carry out a patch test 48 hours before, work in a ventilated space and wear gloves, and keep the product away from the eyes.
What is in the kit, and why clarify before the mask?
The kit pairs the Deep Clean Shampoo (1000ml) with the BTX Volume Reduction Mask (1kg). The shampoo clarifies so nothing sits between the fibre and the mask; the mask is then applied, left to develop and set with heat. Clarifying first helps the BTX work evenly from roots to ends.
Can I use it on colored or bleached hair?
It is generally used on colored and bleached hair, but porosity varies, so a strand test first is essential. Keep the flat iron to the lower end of the range on blonde, red or lightened hair, and let your stylist confirm the result on a test strand before treating the whole head. A slight change in tone is possible.
How long do the results last?
As a BTX volume-reduction, the mask tames frizz and reduces volume, and the effect eases off gradually rather than dropping all at once. How long it holds depends on your hair type, how often you wash and your aftercare. A gentle, color-safe home-care routine helps the result last longer between washes.
What is BTX, or hair botox, volume reduction?
BTX, sometimes called hair botox, is a volume-reduction and conditioning service rather than a straightener. The So Liss mask is built on whey protein and keratin and is labelled 0% formol, so it reduces bulk and frizz and leaves hair softer while keeping movement. It is not vegan.
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. The hair is clarified, the mask is applied evenly, left to develop, rinsed with water and then dried and flat-ironed in slow, even passes at the right temperature. A stylist manages the timing and the heat, which keeps the result even and long-lasting.
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Sarah K So Liss Deep Clean Shampoo & BTX Volume Reduction Mask Kit - 1000ml + 1kg
The complete So Liss BTX volume-reduction kit: clarify with the Deep Clean Shampoo, then reduce volume and frizz with the formaldehyde-free BTX Volume Reduction Mask for softer, more manageable hair.
