ADDS VOLUME, TEXTURE, AND HOLD. Hold on strong to your style with Aussie Instant Volume Style Defining Gel. You define your style—this gel helps you keep it in place. It also boosts up flat hair for extra body and adds a bit of texture and a healthy shine to your hair. How can a hair gel do so much all at once? Miracles do happen, and this miracle comes with a lovely citrus scent.