Designed with equal parts style, innovation, and versatility, the Met-Rx BlenderBottle® SportMixer® rises to the challenge of your active and busy lifestyle, redefining what it means to be a 'water bottle.' Say 'goodbye' to lumpy protein shakes and 'hello' to smooth, great-tasting drinks. Our patented mixing system uses the BlenderBall® wire whisk-found only in BlenderBottle® brand shaker cups-to mix even the thickest ingredients as you shake. The SportLoop™ is surprisingly handy - you'll wonder how you ever went without it. Made from only the highest-quality materials, BlenderBottle® brand shaker cups are-and always have been-BPA and Phthalate free. Made of durable Eastman Tritan™ plastic, the SportMixer lets you enjoy today's smoothie without tasting last week's protein shake. Workouts and workdays can get mundane, but that doesn't mean your nutrition shakes have to. Add ingredients like peanut butter, applesauce, or yogurt to your protein or meal-replacement shakes for added flavor - the BlenderBall whips them in with ease.