Looking for smoother, shinier, more manageable hair? The STS Express Smoothing Mousse is a professional-use-only thermal therapy treatment designed to temporarily straighten and smooth frizzy, curly, multi-textured, or transitioning hair for up to 12 weeks. Infused with amino acids and silk proteins, it strengthens hair from root to tip, delivers frizz-free smoothing, and imparts radiant shine without the use of harsh chemicals. Ideal for clients seeking an alternative to chemical straighteners, this treatment is exclusively available to licensed professionals.