New in unopened box. Sells for $85. Full size product. 1 fl oz, 30ml. Sunday Riley Tidal serum. Deep hydration and plumping. High rating on Ulta. The Sunday Riley TIDAL Deep Hydration & Plumping Serum contains barrier-supporting ingredients that leave skin smooth, bouncy, and deeply hydrated —with a fresh, dewy finish that feels light, plush, and perfectly plumped. Benefits • Layered hydration • Cushiony plumpness • Barrier repair + calm • Water-drop glow Key Ingredients • Five forms of hyaluronic acid deliver hydration through every layer of the skin • Multi-molecular polyglumatic acid locks in hydration • Vegan snail mucin bounce • Water flow optimization • Barrier-strengthening complex