It's Thursday?

It really feels like a Monday. I should have taken today off, like the rest of the smart ones in the office! My 4th of July was perfect, spent at the beach with drinks and friends. Meanwhile, in the middle of this heat wave we're having (which I love and refuse to complain about), my hair has usually been okay with humidity, and has always behaved. I'm not sure what has gotten into these tresses lately, but I'm starting to have some trouble.
I have a feeling I'll be using the product below all.week.long. Anyone else have hair-humidity issues?!