The collagen and folic acid in Suave Volumizing Root Boost Spray ($3; drugstores) give your hair volume when it falls flat and feels weighed down. The nozzle applicator allows you to spray directly onto roots, where you need the most lift. Spray two-inch sections, then blow-dry.
Very thick hair can look dry and dull. The lightweight formula of Kérastase Chroma Cristal ($37; kerastase.com) contains vitamin E to protect color from fading and silicones to add shine. Spray from roots to ends on damp or dry hair.