Product Description

The K18 Leave-In Molecular Repair Hair Mask is a biotechnology-powered treatment that reconnects broken disulfide bonds in the hair — the key structural links damaged by chemical services, heat styling, and environmental stress. Infused with the patented K18PEPTIDE™, this leave-in mask works at a molecular level to restore strength, elasticity, softness, and rebound, without silicones or heavy oils.

This 0.5 oz size is ideal for travel, trial, or targeted treatment areas — and often offered in a 2-pack option for extended use.

Key Benefits

• Repairs and reconnects broken hair bonds
• Improves strength, elasticity, and manageability
• Leaves hair softer, smoother, and more resilient
• Lightweight, leave-in formula (no rinse required)
• Safe for all hair types, including color-treated and fragile hair

How to Use

Apply to damp, towel-dried hair (freshly shampooed, without conditioner).
Work 1–2 pumps through mid-lengths to ends.
Do not rinse — style as usual.

For best results, use on clean hair every 3–4 washes or as needed.

Why We Love It at Soho House Beauty Lounge

This mask transforms hair from the inside out. We love how it delivers professional-level repair without heaviness, making hair instantly softer, stronger, and more resilient. It’s our top recommendation for clients looking to maintain salon results at home — especially after bleaching, heat styling, or chemical services. A little goes a long way, and the travel-friendly size makes it easy to keep your hair feeling its best anywhere.