Matrix Biolage Smooththerapie smoothes unruly hair with the silky serum of Camellia flower seed to continuously control frizz in hot, humid seasons while replenishing hair’s moisture during dry cool seasons. Hair stays naturally smooth year-round. Matrix Biolage Smooththerapie Deep Smoothing Leave-In Treatment's paraben-free formula controls & detangles hair, adding natural smoothness & shine. Direction for use: After Matrix Biolage Smooththerapie Deep Smoothing Conditioner work a small amount of Matrix Biolage Smooththerapie Deep Smoothing Leave In Treatment through towel dried hair. Do not rinse, style as usual.