Sebastian Trilliant: Heat Protection That Also Adds Shine

If you use a straightener or a curling iron and you're not using heat protection, that's the cheapest damage you'll ever fix.

We say it constantly and people still skip it, usually because heat protectants have a reputation for making hair feel sticky or heavy. Sebastian Trilliant is the one we recommend to people who've been put off by that — it's a fine mist that protects and adds shine without the residue.

What heat actually does

A straightener runs at 180–230°C. Hair starts to change structurally from around 150°C. At those temperatures, the water inside the hair turns to steam and forces its way out through the cuticle — which is why over-styled hair gets that rough, bubbled texture and eventually snaps.

A heat protectant doesn't make hair fireproof. What it does is slow and spread the heat transfer, and put a barrier between the plate and the cuticle. The realistic outcome is significantly less cumulative damage over months of daily styling. That's the whole game — it's an insurance product, not a miracle.

What Trilliant does differently

Two things. First, it's genuinely light — a fine spray that doesn't wet the hair down or leave a film, so it works on fine hair where creams are too much. Second, it has a real shine effect, which most protectants don't. Hair comes out of the straightener glossier rather than just undamaged.

It's also useful as a finishing mist on days you aren't heat styling at all, which makes a $49 bottle go further than it looks.

How to use it properly

• On damp hair before blow-drying, or on dry hair before a straightener or wand. Both work.
• Hold it 20–30cm away and mist in sections. Most people spray from too close and soak one patch.
• Let it dry for a few seconds before the iron touches the hair — clamping a straightener onto wet product is how you get that sizzle, and the sizzle is damage.
• Mid-lengths and ends. The roots don't need it and it'll look greasy.
• One pass with the iron at a sensible temperature beats three passes at a low one.

Trilliant or Dark Oil?

They do overlap on shine, so it's a fair question. Trilliant is the protector — light, spray, goes on before heat. Dark Oil is the finisher — richer, adds smoothness and tames frizz, and is at its best on dry hair at the end.

If you heat style regularly, honestly, you want both: Trilliant before, Dark Oil after. If you're only buying one and you straighten your hair every morning, buy the protection.

The part nobody wants to hear

Heat protection reduces damage. It doesn't eliminate it. If your hair is already fragile, the fastest improvement is fewer heat days — even dropping from five to three a week is a visible difference within a month. Pair that with a weekly repair mask and you'll get further than any spray alone will take you.

See the full Sebastian range we stock in NZ, or read our guide to straighteners if your tool is part of the problem.

Free NZ shipping over $75, and every order over $59 comes with a free Kérastase travel-size gift added at checkout. Genuine salon stock, shipped from our Wānaka studio — UKIYO is an authorised Sebastian Professional stockist.

More Sebastian guides

• Dark Oil: the complete range
• Potion 9: the cult leave-in
• NO.BREAKER: bond building explained
• NO.BREAKER vs Olaplex
• Penetraitt: repair for damaged hair
• Hydre: moisture for dry hair
• Twisted: curls without the crunch
• Volupt Max for fine hair
• Hairsprays: Re-Shaper vs Zero Gravity vs Fierce
• Every Sebastian styling product
• Where to buy Sebastian in NZ

Shop the full Sebastian Professional range