The lower part of the straw is flexible so that it easily reaches the fluid and supports a natural drinking position. The straw has an integrated valve to prevent leakage. The hinged lid protects the straw and prevents leakage on the way. The Philips Avent cup with flexible straw can be easily assembled and disassembled. All parts are fully dishwasher safe for added convenience. The Philips Avent flexible straw mug is designed for healthy tooth development and mouth muscle training in collaboration with experts for an optimal straw mug.