Design Essentials STS Express Smoothing Mousse Max Smooth is a fast and easy thermal therapy smoothing treatment designed to transform frizzy, unmanageable hair into long lasting smooth, sleek, shiny hair. Used as the second step in the STS Express Smoothing system, Smoothing Mousse Max Smooth is infused with micro-fine amino acids to strengthen hair from root to tip while delivering anti-swelling and anti-reversion properties for a long lasting, lustrous, frizz-free finish for up to 12 weeks. STS Express Smoothing Mousse Max Smooth is one of the safest smoothing technologies available, as it is formaldehyde and formaldehyde derivative free, and infused with silk protein to nourish and help repair the hair throughout the smoothing process.Key Benefits:Designed primarily for clients who want to wear their naturally curly, transitioning, or frizzy hair in a straight styleFor long lasting, frizz free smoothing with radiant shine (up to 12 weeks)For clients seeking an alternative to chemical straighteners