This is a no-brainer. Keep your hair neat and watch the chicks flock to touch your dome. Keep it clean and healthy, add a great styling product, and you're good to go.

Shampoo: A light shampoo is best for these extremely hot days. Not to mention, having great smelling hair will entice women to join you in the shower. But in all seriousness, this shampoo from Malin + Goetz will keep your hair squeaky clean.
Malin + Goetz Peppermint Shampoo, $20

Conditioner: To avoid any complications, stick to the same brand when choosing the follow-up to shampoo: the conditioner. This M+G version contains shea butter to moisturize and cilantro to refresh.
Malin + Goetz Cilantro Hair Conditioner, $22

Styling: During summer, you want something that doesn't feel like 15 pounds of goop on your head. VitaMan pomades don't require you to use handfuls of it, and has tons of options for every kind of hair.
VitMan Styling Cream, $25