If your hair goes anywhere near a hairdryer, straighteners or curling iron, spritzing one of the best heat protectant sprays is an absolute must. "Think of a heat protectant like a coat of armour for your hair," explains ghd Global Ambassador, Patrick Wilson. By shielding the hair from direct contact with heat – and sealing in moisture – these miracle sprays and mists help to prevent dryness, damage, and breakage. I'll be honest: I never used to apply heat protectant. How I tested heat protection sprays:Mayola Fernandes testing the Aveda Heat Relief Thermal Protector and Conditioning Mist.