The Saturday Baby Straw Cups are made out of 100% food grade silicone material. Put these cups in the dishwasher at home or conveniently wipe them off on the go. The Saturday Baby exclusive lid plug means less mess for you with fewer spills and a tighter fit for the straw. These cups are not spill proof, if they were your little ones wouldn’t learn to properly drink out of a straw. All of our cups are designed to match our bibs! Of course you can always feel safe knowing that all of our products are FDA approved, BPA, PVC, and BPS free.