- K-Gloss S.4 professional hair treatment uses the newest and most innovative technology on today’s market to work with your hair, eliminate frizz, and relax waves and curls. Our formaldehyde-free hair smoothing and straightening products contain natural ingredients that nourish hair and help to fix damage, leaving it soft, vibrant, and frizz-free. K-Gloss S.4 Treatment is the newest professional hair smoothing system.
