When: You want that casual, just-went-surfing look.
Why: It adds texture and volume.
Pro Tip: Spray the salty mix onto damp hair and gently scrunch strands with your fingers. For better hold and definition, blast hair with a diffuser.
Surf Spray by Bumble and Bumble, $27, sephora.com.
Dream Waves Beach Spray by Marc Anthony, $9, ulta.com.