When that happens, water from the environment – sweat, humidity and rain – penetrates the strand, causing it to swell and change form.

Does your hair need conditioner? How to choose one that works for you

What causes frizz?

Four main factors cause frizz. One is the environment.

“Humidity disrupts the hydrogen bonds in the hair, causing it to frizz and shrink,” says Bianca Hillier, celebrity colourist and ambassador for Olaplex, which sells hair repair kits.

Another factor is the thickness of hair – the thicker it is, the harder it will be to modify and reorient it. A third is how curly your hair is. The curlier the hair, the more difficult it is for the strands to align appropriately.

Finally, damaged hair is more susceptible to frizz; split ends, cuticle loss and breakages will make it tougher for the hair to fall into place.

With all that in mind, here is how you can tame frizz for good.

1. Pick a moisturising shampoo

“You start building the moisture in the hair with your shampoo and conditioner,” Camille Friend, celebrity hairstylist, explains. “So pick one designed to inject moisture and instantly hydrate your hair.”

We recommend:

• Kérastase’s Bain Magistral Shampoo

• Oribe’s Gold Lust Repair & Restore Shampoo

• Amika’s Hydro Rush Intense Moisture Shampoo

2. Switch to microfibre hair towels

Your hair is at its most fragile when it is wet – that is why it is so important to use the right products before your hair is dry.

However, frizz might be down to your choice of towel, too. The fibres in regular cotton towels are big and rigid, which can catch and snag your hair and damage it.

Microfibre towels work best for hair that tends to frizz up, as there is less friction and less stress on your hair, and they absorb water faster.

We recommend:

• Coco & Eve’s Microfibre Hair Towel Wrap

• Aquis’ Rapid Dry Lisse Hair Turban

• Act+Acre’s Intelligent Hair Towel

3. Add a hair serum to your routine

Hair serums can make a huge difference to how your hair shapes itself, as they are usually formulated with silicone – molecules which help line up hair fibres, give your hair slip and shine and make strands softer.

“Adding lightweight oils and serums to your hair care routine will help with frizz and dryness,” Hillier advises. But, while certain hair types may benefit from silicone, those with curly or fine hair may want to avoid them.

Serums with silicone alternatives exist – search for ingredients like hemisqualene, which is derived from plant sugar and also protects against colour and heat exposure.

We recommend:

• Virtue’s The Perfect Ending Split End Serum

• IGK Crybaby’s Anti-Frizz Smoothing Serum

• Moroccanoil’s Mending Infusion Styling Hair Serum

4. Start deep-conditioning your hair

We recommend:

• Olaplex’s No. 3 Hair Repair Perfector

• Ouai’s Treatment Masque

• K18’s Leave-In Molecular Repair Hair Mask

5. Do not wash too frequently

In between washes, experts recommend maintaining your hair with dry shampoo, apple cider vinegar rinses or texturising dust. If you need to wash your hair more often, avoid shampoo and use only water and conditioner.

We recommend:

• Living Proof’s Perfect hair Day Dry Shampoo

• dpHUE’s ACV Hair Rinse

• Verb’s Volume Texture Powder

6. Keep heat styling to a minimum

When hair is exposed to high temperatures, we put it at risk of damage, drying out and frizzing.

If you need to use a hair dryer, use a hair diffuser to limit direct heat exposure. Use hair straighteners or curling wands on their lowest setting.

Always apply heat protection first – it will form a barrier against heat damage and seal in moisture for smoother, more glossy strands.

We recommend:

• Dyson’s Supersonic hair dryer

• Redken’s Acidic Perfecting Concentrate

• Olaplex’s No. 7 Bonding Oil