The Saturday Baby Adult Straw Cups are made out of 100% food grade silicone material. Put the cups in the dishwasher at home or conveniently wipe them off on the go. The adult cup holds 28 ounces and has all the same features of our kids cup. Now you can officially match your little one! Of course you can always feel safe knowing this product is FDA approved, BPA, PVC, and BPS free.