Twist, Click, CLOSED! Introducing the new NUK Everlast Straw cup - designed to withstand the daily test a child and dishwasher will put it through and is guaranteed to last through toddlerhood without ever leaking or spilling! Featuring the Everlast seal system with reinforced double seals to assure the lid will not be over or under tightened - just twist until it clicks! The soft silicone straw is gentle on your child's gums and has a built-in valve so it's leak and spill proof even when the straw is open. The cup is 100percent leak-proof and spill-proof - GUARANTEED. Available in Pink, Green and Blue. BPA Free. Dishwasher Safe. Gender: unisex.