If you can relate, you might be in need of a conditioner upgrade. According to Fabian Lliguin, NYC-based hair pro and co-founder of Rahua , a hydrating conditioner will be your best defense against summer damage. "Dry, porous hair is attracted to the moisture in the air, causing the cuticle to swell, giving you frizz and fried-looking strands," Lliguin explains. "The best and easiest way to avoid this is to keep your hair as hydrated as possible, using a sulfate-free shampoo followed by a hydrating conditioner to create a protective, moisture-sealed barrier around the hair shaft."