The Multitasking Leave-In Conditioning Spray
Meet One.Leave — the multitasking leave-in your routine has been missing. One weightless mist does the work of a shelf full of products: it protects against UV and heat, floods dry lengths with moisture, tames frizz and leaves a soft, glossy finish. Built for summer, holidays and everything the weather throws at your hair — and two years in the making, because we wouldn't launch it until it was perfect.
Powered by an 18-amino-acid + collagen complex:
• Amino Acid Complex – 18 amino acids that strengthen the hair fibre and support repair
• Hydrolyzed Collagen – film-forms to improve resilience and resistance
• Panthenol (Pro-Vitamin B5) – deep hydration, elasticity and shine
• Coconut Water (Cocos Nucifera) – lightweight hydration and minerals
• NMF-like humectants (Sodium PCA + Sodium Lactate) – lock in long-lasting moisture
• UV Filter (Ethylhexyl Methoxycinnamate) – shields hair and colour from the sun
• Next-gen silicones (Dimethicone, Phenyl Trimethicone) – heat protection, smoothness and shine
• Conditioning agents (Quaternium-80, Behentrimonium Chloride) – anti-frizz, detangling and slip
• One Spray, Every Job — UV, heat, hydration, anti-frizz and shine in a single weightless mist
• UV & Colour Protection — a UV filter shields hair from the sun and helps prevent colour fade
• Heat Protection — guards against blow-dryers and hot tools, up to 200°C
• Deep, Long-Lasting Hydration — an NMF-like humectant system and pro-vitamin B5 flood dry lengths and hold moisture
• Repair & Strength — an 18-amino-acid and collagen complex helps restore and strengthen the fibre
• Anti-Frizz & Anti-Humidity — smooths flyaways and holds smoothness, even in humidity
• Lightweight & Non-Greasy — weightless, never weighs hair down or leaves residue
• Soft, Glossy Finish — leaves hair silky-smooth with a healthy shine
• Detangles & Softens — adds slip for easier combing and styling
• Built for Travel — protects against sun, salt, chlorine and pollution wherever you go
Summer is brutal on hair. Sun fades and dries it, salt and chlorine strip it, humidity undoes your style and heat tools add to the damage — and most routines need three or four separate products to cope. One.Leave replaces all of them. A single leave-in mist that protects, hydrates, smooths and adds shine in one step, so your hair stays healthy and holiday-ready with none of the effort.
On damp hair (main use):
- Wash and towel-dry to remove excess water.
- Spray directly onto hair, or into hands.
- Apply from mid-lengths to ends, avoiding the roots.
- Comb through and style — blow-dry or air-dry.
On dry hair (touch-up): spray into hands and smooth over ends and dry areas, 2–6 sprays depending on length. Use before heat styling.
Tip: use a little less on fine hair; apply more generously and comb through on thick or curly hair.
One.Leave launches mid-July. Join the waitlist now for 25% off and first access.
Trusted By Over 3000+ Salons Worldwide
Doorstep delivery across the UK, US and EU.
All our packaging is 100% recyclable
Founded in the United Kingdom
Sun Shield
A built-in UV filter protects hair and colour from sun exposure and fade.
Heat Defence
Shields hair from blow-dryers and hot tools, Shields hair from blow-dryers and hot tools.
Moisture Magnet
Locks in long-lasting hydration for soft, supple, flexible lengths.
Humidity Armour
Tames frizz and holds smoothness, even in high humidity.
Strength Complex
18 amino acids and collagen reinforce and strengthen every strand.
Fast & Effortless
One weightless, leave-in mist; no rinsing, no downtime.
