| Rusk's Thermal Str8 Ceramic Smoothing Tools Protective Conditioner Thermal Str8 liquids condition & protect the hair internally and externally. UVA/UVB sunscreens, and exclusive Thermplex heat protection combined with Ceramix leave hair smooth, silky-soft, sleek and shiny. A fast-acting, daily conditioner enriched with sunscreens and silicones to protect hair internally and condition the hair where it is most needed without causing unwanted buildup. . |  |