1. In the shower: If your hair is thick, use the shampoo and conditioner recommended for curly hair. If it's fine, volumizing formulas—like Aveeno Nourish+ Volumize Shampoo ($6.50; drugstores) and Nexxus Dualiste Color Protection + Volume Conditioner ($16; drugstores)—give waves a little extra lift.
2. When hair is still damp: Wavy hair tends to be dry, so the outer layers can look fuzzy; a styling cream like Sunsilk (above left) controls flyaways. To coax out more dramatic waves, you can layer on Fekkai Beach Waves ($23; Sephora.com); it contains sea algae extract to enhance any natural bend in your hair.
3. Just before you leave the house: To block humidity (a preemptive strike against frizz), apply a drop of a silicone-based product, like Matrix Sleek.Look Sealing Serum ($17; Matrix.com for salons).
See the best cut for wavy hair in the summer