Easy to use, 2-step leave-in thickening treatment interlocks with hair to expand the diameter of each strand. Amino Acids combined with substantive conditioners enforce bonding of the thickening agents to the hair. Color safe. Fine or thin hair is transformed into thick, fortified hair with double the body. Smoothes flyaways, controls static and offers long-lasting thickening benefits. Use 1-2 times per week for best results.