Osis+ Big Blast is a strong-hold volumizing gel from Schwarzkopf's professional line, built for root lift: work it into towel-dried hair at the roots, then blow-dry with a round brush to build volume that holds without turning stiff or crunchy.
The shine-without-heaviness feel comes from PEG-based silicones (PEG-14 and PEG-12 Dimethicone) layered onto the hold polymers (VP/VA Copolymer, Acrylates/Steareth-20 Methacrylate Copolymer, Polyquaternium-68) — the silicones are what keep a strong-hold gel from feeling crunchy, since hold polymers alone tend to set hard.
Apply to towel-dried or damp hair, working from roots toward ends, then blow-dry with a round brush for lift.