Before you put on your hat
To lock in volume from the start, apply a volumizing mousse or re-moldable pomade at the roots of your hair. “Massage your scalp in a circular motion,” says Cristophe. Then, with your dryer on low heat, aim the heat against where you want your part to fall, says Grmolyes.
The trick here is to use a product that can be quickly re-activated by water or heat. This way, once you take your hat off, you just need to apply water or heat to your hair to bring back the volume. Here are a few of my favorite recommendations: