33.8 oz (1 Liter). Thickening Conditioner What it is: A featherweight moisturizer and detangler with ultra-light silk fibers. What it does: This conditioner moisturizes, protects, and separates strands to make fine hair look and feel fuller. It's ideal for thinning, limp, or flyaway hair. What else you need to know: For really full results, pair with Thickening Shampoo, Thickening Serum, and Thickening Hairspray. This product is also compatible with color-treated hair.