A new and improved no smoke/smell, formaldehyde-free straightening hair treatment for seriously sleek, frizz-free hair as well as a curly hair treatment for controlled curls. Gain control of your hair with Sisters Hair Solutions for long-lasting straightening, reduced frizz or defined curls to increase manageability through all weather conditions. Our hair treatments are vegan friendly, formaldehyde-free, and are suitable for all hair types. Hair colour and extensions can also be applied on the same day.