Our baby bottles are made of the highest quality, thermal shock resistant borosilicate glass. This allows our bottles to transition safely from freezer to boiling water. The silicone sleeves provide a good gripping surface for little hands and help protect against the occasional drop. Glass bottles and silicone nipples are made in France. Silicone sleeves and plastic caps are made in the U.S. All components are BPA-free and phthalate-free.