Heavy duty styling product advice kindly requested!

[DollyPartonsBeard]

Can I ask for recommendations for a styling product (preferably widely available on the high street?

My hair is thick and wavy/ curly. It's in a chin length inverted bob. I did a Brazilian blow dry treatment thing on it last week and the frizz reduction/ smoothing effect has been near miraculous (so big thanks to everyone who contributed to previous threads, which were a mine of useful info)

Anyway, without straightening, the longer bits are wavy and that's fine. But I have an interview on Thursday and I'm wondering if you can recommend a heat protection/ straightening product that will keep the errant bits looking straight all day? I don't plan on heat straightening my hair every day, but would like to look ultra swishy for my interview!

Many thanks