EVERYONE knows that a decent hairdryer is worth it's weight in gold as it can totally transform your locks.

But one thing very few people care about when shopping for the beauty tool is a cold air function.

That little button that switches your machine from blowing hot air to cold, is actually very important – even if most of us ignore it.

But actually that little button is very handy and it may shock you to find out why.

Blowing hot air onto your tresses is a speedy way to banish the water and lock in your style.

But it can also really damage your hair, drying it out and can cause your do to drop out through the day.

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Even with the benefit of a heat protector, your hair can get frizzy and frazzled.

If you opt to dry your hair on the cooler setting, not only are you less likely to cause harm to your locks, but your style will stay in place longer.

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The pros suggest drying your hair on the hot setting until you're about 80 per cent there.

Then, when it's still a bit damp, switch to the cold setting to lock in that shine and style.

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