Having long hair is a blessing as well as a curse. When it is cold and windy outside, medium to long hair will get static like you've been taking a tumble in the dryer! If you're in a time bind or don't want to spend a lot of money on those hair treatments that are supposed to get rid of static/frizz, this might help you!
Another great idea is to rub a gentle lotion on your hands and run it through your hair. It doesn't work as well as the dryer sheet, but if you don't have dryer sheets available, this will help if you're in a hurry!