The Sky Saturday Baby Straw Cup is crafted from 100% food grade silicone, making it safe for your little ones. Run it through the dishwasher at home or easily wipe it clean while out and about. The lid plug is a special feature that helps prevent spills and ensures a snug fit for the straw. While the cup is not spill proof (because let's face it, that would defeat the purpose of learning to drink from a straw), rest assured it is FDA approved and free from harmful chemicals like BPA, PVC, and BPS.