humid weather. i assumed (incorrectly) that this product was a spray, but it's actually like a serum. i only use one pump and rub it between my hands and apply it down the lengths of my hair. it feels awesome to apply, and it really does protect my style from the humidity. i definitely feel that it protects my hair from the heat during straightening too. have never used a product like it, but i would definitely recommend it.
i bought this after my hairdresser recommended it. i blow dry and straighten my very frizzy hair every day, and he suggested i use this as it offers the best heat protection 