Straw. Number 1 selling spill-proof cup brand. Twist 'n click leak-proof seal. 100% spill-proof, leak-proof, break-proof guarantee. BPA free. With the twist 'n click cup feature, simply twist lid on the cup until you hear and feel the lid click closed, then you'll know the cup is 100% leak-proof. Designed for baby: designed with a child development expert to easily grip and sip. Straw helps promote mature mouth movements. Narrow waist at top allows for more control in sipping. Easy to drink from because lid and cup are always aligned. Designed for mom: no-roll square shaped bottom fits in most cup holders; child-proof straw cannot be removed from top of cup; lid is interchangeable with all Playtex cups; all parts are dishwasher safe. Made in China.