Durable Tritan Plastic: Made from BPA and phthalate-free Eastman Tritan plastic for long-lasting use. Secure Lid: Screw-on lid creates leak-proof seal and flip cap keeps mouthpiece clean. Mixing System: Patented wire whisk and BlenderBall create a smooth, consistent blend. Portable Design: Wide loop top allows easy carrying and attaching to keys. Complete Nutrition: Perfect for protein shakes, smoothies, and pre-workout supplements.