I do not proclaim myself a hair expert— I usually let it air dry and rarely brush it. That said, I am totally convinced that these 3 products make my hair a little more messy, a little more beachy, and actually give my super straight hair some natural waves.
First, work with your hair right after washing when damp*. Add some weightless texture and hydration into the ends like Fekkai Glossing Cream or try a hydrating serum like Dove Frizz-Free Shine Cream serum.
Next, spray the Bumble & Bumble Surf Spray all over damp hair to create some waves and scrunch fistfuls of hair while you go. A great drugstore alternative is Aussie Sprunch Spray.
Then, just spray some flexible hold hairspray onto the scrunched sections and twist the hair into a loose bun. Let your hair air-dry. The more up-into-a-bun and down your hair goes throughout the day, the more kinky and wavy it gets (at least for me).
*Damp, meaning still wet but almost dry. Wet hair will not hold onto the product.