Curled Bob. If you have thin hair that’s wavy, an easy way to add volume is with some hairspray and a curling iron (and a teasing comb never hurt). If you have super straight hair and don’t want to curl it every day, don’t worry—we hear perms are coming back, and they’re way more stylish now. Bob with Deep Side-Part. Parting your hair with a deep part to one side adds immediate volume. Try parting it to the opposite side than you usually do for even more of a volume boost.