Retex Hair Straightening System Agave Retex Hair Straightening System (Previously Bio Ionic Retex). Get it super-straight, create a little wave, or just eliminate the frizz! You choose with the original, industry-first thermal straightening system. The power of IonTransformation® is fully realized with Agave’s Retex system. Permanent straightening Leaves hair vibrant, healthy looking, Softens and straightens hair Silkens and smoothes hair, Gives body and bounce adds glossy shine One formula for all hair types, Can be used on colored or permed hair Thioglycolate-based, Formaldehyde-free formula, Advanced ionic technology RTX System Step #2 Neutralizing cream - 12 oz