Sarah K So Liss Step 2 Expert Tech Progressive Keratin and Protein System - 1000ml

Formaldehyde-free keratin treatment | Smooth and hydrated finish | Professional long-lasting frizz control

Overview

The Sarah K So Liss Step 2 Expert Tech Progressive Brush is a formaldehyde-free keratin treatment designed to deliver smooth, frizz-free, and hydrated hair. Infused with whey protein and keratin, its advanced formula enhances shine and softness throughout the straightening process, leaving hair silky, manageable, and healthy-looking.

What It Does

• Straightens and smooths unruly, curly, or frizzy hair
• Provides deep hydration while maintaining softness and shine
• Strengthens the hair fiber for resilience against breakage
• Controls frizz and reduces unwanted volume
• Delivers professional salon results with lasting smoothness

Key Ingredients

• Whey Protein - Nourishes, reduces frizz, and helps preserve hair strands
• Keratin - Reconstructs the inner strand structure for strength and smoothness
• Shea Butter - Provides moisture and softness
• Macadamia & Coconut Oils - Add shine, conditioning, and flexibility
• Hydrolyzed Collagen - Improves elasticity and resilience

Who It Is For

Recommended for:

• Curly, wavy, or frizzy hair (Types 2A–4C)
• Clients seeking long-lasting smoothness without harsh chemicals
• Thick, resistant, or high-volume hair prone to frizz
• Color-treated or chemically processed hair needing reconstruction
• Salon professionals requiring consistent and safe keratin performance

How to Use

1. Wash hair with So Liss Step 1 Deep Clean Shampoo. Leave on for 3 minutes during the last wash. Rinse thoroughly.
2. Dry completely. Divide hair into 4 sections.
3. Apply Step 2 evenly from root to tips, strand by strand. Comb through to distribute.
4. Leave on for 40 minutes. Rinse thoroughly with lukewarm or cold water for 5 minutes.
5. Apply Neutralizing Mask SK (for dark hair) or Neutralizing Blonde Mask SK (for blonde hair). Leave 5–15 minutes, then rinse.
6. Blow-dry and straighten in thin sections at 190–230°C, 7–10 passes per strand. Focus more on roots and less on ends.

Pro Tip: Always perform a strand test before full application. Use protective gloves, maintain ventilation, and adjust flat iron temperature according to hair sensitivity.

Complete Your Routine

• So Liss Step 1 Deep Clean Shampoo - Essential pre-treatment cleansing

Main Benefits

• Formaldehyde-free professional straightening system
• Lasting smoothness with shine and hydration
• Strengthens and reconstructs hair from within
• Reduces frizz and improves manageability
• Salon-size 1000ml for multiple applications

FAQ: Progressive Keratin Treatments

What is the difference between progressive and regular keratin?

• Regular keratin treatments deliver instant results but usually last around 3 months. Some require waiting 48–72 hours before washing and may flatten natural volume.
• Progressive keratin treatments build results gradually with each session, allowing hair to remain smoother, shinier, and more manageable over time. They usually last 4–6 months and often allow same-day washing.

How often should progressive keratin be applied?

• On average, every 4–6 months depending on hair texture and maintenance routine.
• Thick or resistant hair may need reapplication after 3–4 months, while finer hair may last longer than 6 months.
• Results last longer with sulfate-free shampoos, keratin-safe conditioners, and proper aftercare.

Summary

The Sarah K So Liss Step 2 Expert Tech Progressive System is a professional keratin treatment that ensures smooth, frizz-free, and luminous hair without formaldehyde. Enriched with whey protein, keratin, and nourishing oils, it hydrates while strengthening the fiber. Perfect for stylists delivering safe, effective, and long-lasting straightening results.

Size: 1000ml (33.8 fl oz)