Milbon Grand Linkage Hair Treatment MU4 is a professional-grade hair treatment specially formulated for color-treated and chemically processed hair. It helps to restore smoothness, moisture, and shine while maintaining the vibrancy of colored hair. This intensive treatment works to repair damage, strengthen hair strands, and improve manageability by sealing the cuticle layer. Ideal for medium to coarse hair, the MU4 treatment deeply nourishes and protects, leaving hair soft, silky, and frizz-free.