What It Is:A serum-potency lip treatment that replenishes, plumps, defines and shines. The conditioning formula features Bobbi Brown's Extra Plump Complex, a lip-loving blend of moisture-boosting botanical oils and ultra-hydrating ingredients, including hyaluronic acid.What It Does:The powerhouse formula delivers nourishing care with 24-hour moisture for smoother, plumper-looking lips and 8 hours of amped-up shine.How To Use It:Swipe on Extra Plump Lip Serum under or over your favorite lip color (it pairs well with Extra Lip Tint) for long-lasting hydration and shine.