Hair products that keep your hair straight even in the rain or when sweating?

My hair is naturally wavy, but every morning or every other morning I straighten it. But I was wondering, is there any hair product that will leave my hair straight through-out the day, even if I sweat or if it rains?

Because my biggest problem right now is that it when I walk to school, I walk up this huge, steep hill so I start to sweat a bit and then my hair gets wavy. And also, since it's winter and it's been snowing/raining, that also makes my hair wavy.

So is there any product out there that will make it stay straight?

Hair products that keep your hair straight even in the rain or when sweating?

garnier fructis anti-humidity

Hair products that keep your hair straight even in the rain or when sweating?

I had good results with Matrix Sleek Look shampoo %26amp; conditioner, and FX Straighten Out gel. The gel works really well on controlling the frizz on humid days too, which is a plus.