It really depends on the length of hair, and can you let it dry while still having a bit of moisture. I used to wax and stuff to mold the hair in place, but I'm much less picky most days so I just push it up after my shower and style it when it's damp-ish. It should finish drying and mostly maintain the shape unless the hair is excessively long then you need some product.

I would assume you need product to pull of the hair in the picture.