WHAT IT IS OSiS Gelastic gives you flexible texture with a strong hold. WHAT IT DOES Schwarzkopf Professional OSiS Gelastic is an ultra strong hold styling gel that provides your hair with flexible hold and styling. Dries to a firm hold finish. The long-lasting formula ensures your style holds all day while leaving your hair looking shiny sleek and healthy. This styling gel is also perfect for separating curls while providing natural movement.