Tresemme 7 day keratin smooth styling bag gift set tresemme 7 day smooth system works with the heat of your straightener to transform unruly locks into gorgeous salon smooth hair that lasts for a whole week you can easily create your style every day with less frizz and more manageability all contained within a bag with a heat resistant styling panel for the ultimate salon experience step 1 prepare your hair with tresemme 7 day smooth shampoo and conditioner and towel dry step 2 apply 8