OSIS Professional Hair Styling Products by Schwarzkopf. OSIS is a trendsetter in hair styling products. Stuck in a styling rut? Following the same daily routine? Need some fresh inspiration? OSiS inspires you to Kill routine- with consistencies & products that are sure to inject some energy and creativity into your salon. Get inspired and reveal the individuality of each of your clients and create their unique style! OSIS Hair Sprays- Pastes- Waxes and Gels are all you need for your daily styling routine.