Glass Hair Smoothing Oil
By Sleek
Price range: £16.00 through £36.00
- Delivery by Wednesday 29 Jul
- You could earn 16 reward points
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What it does
Benefits
- Tames frizz and flyaways instantly
- Seals split ends
- Glass-like shine, never greasy
Suits
Suitable for all hair types.
Targets
Dryness, Frizz
Formula & key ingredients
Hero ingredients
- Argan OilTames frizz and adds mirror shine
- Marula OilWeightless moisture that never sits greasy
Full ingredients (INCI)
Cyclopentasiloxane, Dimethiconol, Argania Spinosa Kernel Oil, Sclerocarya Birrea Seed Oil, Tocopherol, Parfum, Limonene, Linalool.
A weightless dry oil that tames frizz, seals split ends and leaves hair with a glossy, glass-like finish — never greasy.
How to use
- How often
On damp or dry hair
- Where
Mid-lengths & ends
- How
Warm 2–3 drops between palms and smooth through, before or after styling. Avoid the roots on fine hair.
A fast-absorbing blend of argan and marula oils smooths flyaways and adds instant mirror shine on damp or dry hair. Light enough for fine hair, nourishing enough for coarse — a few drops is all it takes.
Specification
- Brand
- Sleek
- Format
- Lightweight dry oil
- Hair type
- All hair typesDry / damagedThick
- Free from
- Parabens
- Certifications
- Cruelty-freeVegan
- Size
- 100ml30ml
- Hair Concern
- DrynessFrizz
- Ingredient
- Argan OilMarula Oil
- SKU
- DEMO-HR-03
Royal Mail Tracked 24
- Order before 9 pm for same-day dispatch and next-day delivery*
- Deliveries are made 7 days a week (excluding postcode exceptions* and bank holidays)
- Tracked service with a 2 hour delivery window
- Safe place option
- FREE on orders over £30
- £2.99 for orders under £30
*Orders to remote areas listed on Royal Mail's exclusions list may not arrive until a day later.
DPD Local & DPD Local Pickup
- Order before 9 pm for same-day dispatch and next-day delivery
- Deliveries are made 7 days a week (excluding bank holidays)
- Tracked service with a 1 hour delivery window
- Signature required, or safe place option and collection point
- £4.99 for orders under £20 (£6.99 at weekends)
- £3.99 for orders between £20 and £59.99 (£5.99 at weekends)
- £1.99 for orders over £60 (£3.99 at weekends)
- FREE for orders over £100 (£150 at weekends)
EVRI
- Order before 4:30 pm on weekdays for same-day dispatch
- Order before 11 am on Saturday for same-day dispatch
- Deliveries are made Monday to Saturday (excluding bank holidays)
- Fully tracked service
- £1.99 for orders under £30
- Two-day service FREE on orders over £30
Royal Mail Special Delivery
- Order before 9 pm for same-day dispatch and next-day delivery*
- Deliveries are made Monday to Saturday (excluding bank holidays)
- Tracked service with a 1 hour delivery window
- Signature required
- £7.99 for orders under £20
- £6.99 for orders between £20 and £59.99
- £5.99 for orders between £60 and £99.99
- £4.99 for orders over £100
*Orders to remote areas listed on Royal Mail's exclusions list may not arrive until a day later.
All orders are sent in discreet packaging.
Please view our delivery page for further information.
Reviews
Based on 2 reviews
- Effectiveness 4.5
- Texture & feel 4.5
- Value for money 4.5
2 reviews for Glass Hair Smoothing Oil
Why Beautyforest
Meets The Beautyforest Standard
- Clean & naturally derivedNo greenwashing, no empty claims
- Science-backedFormulas proven to actually work
- Cruelty-freeKinder beauty by default
- Free UK delivery over £30Easy 30-day returns


Priya D. (verified owner) –
Actual glass hair
Two drops and my frizz is gone with the shiniest finish. Not greasy at all.
Sam W. (verified owner) –
A little goes far
Great shine but easy to overdo on fine hair — start with one drop.