Frizz isn't just part of having curly hair. More often than not, it's caused by dryness, which lifts the hair cuticle and allows moisture in, creating that fluffy, frazzled look.One of the biggest culprits is humidity. Here in the UK, our damp climate and near-constant drizzle make frizz a year-round battle, so it's safe to say I've put plenty of the best anti-frizz products to the test.Beyond the weather, some everyday habits can also be making frizz worse. Hot showers can strip away the hair's natural oils, while over-brushing can leave curls looking fluffy and undefined. That's why common frizz-fighting advice includes finishing with a blast of cold water, only brushing hair when it's soaking wet, and switching to sulphate-free shampoos.Thankfully, there’s no shortage of products promising to fight frizz. After testing countless formulas (and ruling out plenty along the way), I’ve found the ones that truly deliver for frizz-prone curls.Read more: I tested Garnier’s £10 diamond sleek against Color Wow’s dream coatI tested oils, serums, masks, creams and more (Louella Berryman/The Independent)Best overall – Umberto Giannini curl jelly: £6.17, Boots.comBest budget buy – OGX quenching+ coconut curls conditioner: £4.50, Amazon.co.ukBest hair oil – Ouai hair oil: £26.49, Amazon.co.ukBest curl cream – Cantu shea butter for natural hair coconut curling cream: £4.49, Amazon.co.ukBest serum – Davines curl building serum: £24.50, Davines.comRead more: Best leave-in conditioners, tested