OSiS Session Label Strong Hold Hairspray is an innovative micro-diffuser spray technology delivers an ultra-fine, strong holding mist to the hair, for uncompromising control that’s a cinch to brush out. New Hairspray Technology New Micro-Diffuser Technology combined with an instant-dry formulation assures a fine spray distribution and a super dry hair feeling. Directions Of Use Mist evenly over dry hair, holding spray approx. 30cm away. Finish or reinvent your style as usual. Session kit essential for styling dry hair with hot tools.