Hair MVPs: Hair Stylists Reveal Their Most Valued Products

Wella Professionals Brilliance Treatment

Why it's a winner: Both varieties of the treatment—a lightweight mask for fine to normal hair, and a creamy one for coarse hair—contain diamond dust, which reflects light and gives hair instant sheen. Vitamin E in the formulas protects haircolor and prevents it from fading.

Recommended by: Rick Wellman, co-owner of Patrick Melville Salon & Spa in New York City

$12; wella.com for salons