Rid Your Noggin of Frizzy/Curly Hair
Hair strand magnified - Cuticle visible
If you could look at a hair under a powerful microscope you would see that the scales growing over the youngest part of the hair (the part that grows closest to the scalp) are smooth and unbroken.
Further along the hair, you would be able to see that they may have been damaged by cosmetic treatments ( flat irons, over processing, etc).
When the hair's cuticles are smoothed down and going in the same direction the appearance will be shiny and smooth, therefore lessening/eliminating frizz.
Remember this theory for other things you do to your hair such as : putting clothes on over the head, wearing hats, swim caps, brushing hair upside down(that's a 'no'). The roughing up that the towel drying creates sets the entire styling process up to fail for you, its a very easy step, put a post-it on the bathroom mirror right now if you must.