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. Our Starter Sets make beautiful gifts for new and expectant moms. They're perfect for baby showers and they're easy to wrap. A great way to ensure baby gets off to a healthy start. 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. Lifefactory fuses a modern design sensibility, healthy materials, friendly composition and exceptional utility to produce a full line of safe, simple and smart products.