Used by professionals. Expert selection. Keratin smooth. New thermal technology. Designed for use with flat iron. Our Philosophy: This range has been carefully selected for its latest technology, driven by our salon heritage we work with our stylists to deliver expert solutions from salon quality products. TRESemme professional, affordable. Why Use 7 Day Keratin Smooth Heat Activated Treatment? This heat activated treatment, as part of the 7 Day Smooth System, works with the heat of your flat iron to transform unruly hair into salon-smooth hair that even lasts through 3 washes. You can easily create your style every day with less frizz and more manageability. For more information on how to get 7 Days of salon smooth styles, visit tresemme.com. Contact us at www.tresemme.com. Now style your hair every day and continue to use 7 day Keratin Smooth Shampoo and Conditioner throughout the week. Enjoy your gorgeous, salon-smooth hair for the week or up to 3 washes. Made in USA.