- An ultra, lightweight mousse that provides flexible volume to help fine, flat hair to look, feel and behave like naturally full, thick hair. It is powered by our patented Thickening Molecule (PBAE), which creates thickening dots between hair strands so it feels like you have thicker hair. PBAE lasts 5x longer. Full Thickening Mousse: provides long lasting thickness and fullness; light hold that doesn't collapse or become stiff. Full Thickening Mousse is ideal for fine, flat hair. It is silicone-free. Safe and formulated for color and chemically treated hair. Shake can well. Hold can upright to dispense and egg sized amount. Do not hold can upside down when dispensing. Apply to damp hair from roots to ends. Comb through and blow dry to activate. Tips + tricks: Use a round brush to create volume when blow drying. Air dry for a more tousled, natural look. Applying Full Thickening Mousse to clean hair and blowing it dry will maximize your volume. Air drying will give you texture and definition, but not as much volume and height as heat styling will allow.