Design Essentials® STS Express Smoothing System is an amino-acid infused smoothing and thermal therapy system that temporarily straightens and smooths frizzy, naturally curly, multi-textured, transitioning, and chemically treated hair—providing up to 12 weeks of intense smoothness, incredible shine, and maximum manageability.

This easy, three-step system increases style longevity while helping to strengthen and repair damage. The STS Express Smoothing System saves time in the salon—no need to shampoo twice. Simply Shampoo, Treat, Seal, and Style for up to 12 weeks of visibly smoother, shiny, more manageable hair.