Our award-winning sippy cup features our innovative b.box weighted straw that moves with the liquid – whatever angle the cup is tilted. The straw has a unique two-way valve, ensuring easy drinking and no leaks, even with warm water. Weighted straw moves with the liquid for drinking from any angle Leakproof design with unique two-way valve, suitable for warm or cold liquids Easy-grip handles encourage independent drinking Flip-top lid keeps straw top clean and hygienic Base also fits training cup lid and spout cup lid Dishwasher safe Sippy cup base is microwave safe; do not microwave lid or straw Made from PP and silicone, with steel weighted ball Free from BPA Capacity: 240mL / 8 fl. oz Care instructions: Dishwasher safe. Microwave safe for cup base only; do not microwave lid or straw.