Staticky hair happens when your hair builds up an electrical charge. If you need a refresher on the science, we've got you covered! Static electricity is created when two unlike objects rub against each other, causing electrons from one object to be transferred to the other. The object that loses the electrons gets a positive charge, while the object that gains electrons get a negative charge.
An easy example is hat hair. When the material of your hat rubs against the strands of your hair, they swap electrons. This swap causes a kind of electric charge to build up on your hair. If there is humidity in the air, the charge can usually just go away. However, if there isn’t any humidity or moisture in your hair, like on a dry winter morning, the charge causes your strands to repel from another like a magnet. Electric charges don't flow through water, so the lack of humidity typically found in winter months makes hair static more prominent. This also explains why dry and damaged hair is more prone to hair static.
In short, your hair static happens because your hair is literally so full of electrons that it can’t stand itself. Now, that you know what causes static electricity let’s talk about the ways to fight it.