Finally a straw that doesn't make a mess Children of 10 months and over just love straws. So that's why, with the NUK Flexi Cup, they will enjoy drinking by themselves, without a drop going astray. Ideal for on the go: The soft, flexible silicone straw can be easily "bent" and made to disappear under the cap. No mess from the straw: The novel NUK Special Vent is not only leak-proof, it also prevents liquid remaining in the straw. Even on opening the cup nothing can make a mess or squirt. Extremely durable: The cup is made from polypropylene (PP) which is equally light and tough - free from Bisphenol-A, of course. Hygienic and practical: Close the cup by using the integrated protection cap and use the clip to attach it to bags or clothing. Mix and match: The soft-straw cap is compatible with all NUK FIRST CHOICE bottles.