WHAT IT IS OSiS Fiber Light is a lightweight styling fluid that delivers natural definition and texture. WHAT IT DOES Schwarzkopf Professional OSiS Fiber Light is a fibrous fluid that creates weightless elastic definition. The light texture of the fluid is made up of airy fibers that allow for perfect style control without overburdening the hair. Get limitless restyling and moldable definition with a feather light touch that keeps hair looking healthy and natural. An infusion of Shea Butter smooths and softens the hair making for a silky finish that lasts. Infused with Shea butter this OSiS Fiber Light fluid softens the hair and leaves a silky finish that lasts all day.