Since dyed blonde hair tends to be more fragile, protecting it while styling is super important. Mesquit recommends Ouai's Memory Mist Heat Protectant because "it has a higher heat resistance than most at 450 degrees, and also helps hair to hold its style until your next wash."
Another heat protectant to look into is one made specifically for blondes by Kerastase. Dorsey says, "Not only does it protect the hair from heat caused by styling, but in the process makes the hair feel smoother and look shiner.It's designed specifically for lightened and highlighted hair in mind. Also, it contains hyaluronic acid which, yes, plumps the hair fiber."