Which are the good hair heat protection sprays?

[Farahilda]

I'm clueless about this, as I don't style my hair at all.

But DD is fiddling about with hers non-stop and has just bought some much-coveted heated styling tools. She's got quite long hair, and wants to keep growing it, so I was wondering if a heat protection spray is a useful product anyhow (to minimise the length of frazzled ends that need trimming off).

And if so, are there any that are better than others? It's for curling, rather than straightening, if that makes a difference.