Strengthening STS System by Design Essentials.
The Design Essentials Strengthening Therapy System Express (STS Express) is a three step system designed to maximize manageability and increase the time your style lasts, while simultaneously making your hair stronger and repairing damage. STS Express does this through an amino-acid infused smoothing and thermal treatment that temporarily straightens and smooth frizzy, naturally curly, transitioning, multi-textured, and/or chemically altered hair for approximately 12 weeks. The benefits include “long lasting smooth, intense frizz protection, enhanced manageability. hair growth, safe and effective (Formaldehyde free), proven on all hair textures”.