Double ponytail with scarf/headband for biker girls that suits any face shape
Oke, so I'm a girly girl and I usually do my hair with lots of volume and curls (I have very straight fine hair). My face is very full, with broad cheekbones and jawline but narrow on top (triangular). To balance this out I need volume on top, which is impossible when wearing a helmet and having naturally straight fine hair.
(honestly nóthing is going to keep my hair from laying flat. Using hair products like hair-powder is only going to make my hair take on the flat shape more, same with hairspray or other products).
So my solution is embracing the flatness of my hair, but finding a hairstyle that makes the flatness look cute on my broad egg shaped head. A cute hairstyle for my face (that I rocked when I was young) is the double ponytail. I get to show my hair at the sides of my face, but in a way that it doesn't bother me when riding. So i part my hair slightly of center and put it in two ponytails behind my ear. To make sure my long hair doesn't get all tangled I put a few more elastic bands in the ponytails with a couple of cm between them. To make it extra cute (and sort of stylish) i pull the hair in between the bands so it gets a little puffy.
Then to give my face/head volume on top I put on a scarf with irregular patterns (again, to soften my strong jawline and it doesn't show sweaty parts that obvious ;)). I wrap it around my head (before and behind the ponytails) so it stays on secured. I use a scarf that is not very soft and silky, but organic cotton, thin but sturdy material. So when I take of my helmet I just pull my flat scarf a little on the sides and on top and the fibers crab into themselves so it stays up on itself. This way I create the volume my face needs, my hair is away from my face and I still look cute. When we stop I just check 2 seconds in a small hand mirror and i'm good. No combing or fluffing hair, or spraying stuff around, so nobody has to wait for me and I feel very comfortable taking my helmet off at any time :).
This is the girl who inspired me: https://s-media-cache-ak0.pinimg.com/236x/39/f4/89/39f489c04086ef6a00c245780572cc5d.jpg
If you are blessed with an oval, long, heart of diamond shaped face you might not need any volume on top, and you can just rock any kind of hairdo. But for the more angular face shaped girls: this can be very helpful :).