best straightening products please ???

[cheeryface]

after mumsnettters converted me to kerastase shampoo and conditioner i have now had my hair cut into a bob and because it has a wave to it it only looks good when straightened.
no sooner have i done it though it is flicking out and going wavy again.
so, what are the best products i could use ?

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I have been searching for 30 years and the only thing that works for my wavy hair is Yuko.

thankyou, never heard of yuko

It's a permanent straightening system. It takes about 4/5 hours to have done and costs a few hundred pounds but is totally worth it.

The problem with all the serums etc. (with my hair) is that they work and I can get lovely straight glossy hair but as soon as I hit a bit of humidity or rain my hair is a wavy mess again. Yuko stops this and makes it loads quicker to do my hair.