Extend the life of your Lifefactory 4 and 9-ounce Glass Baby Bottles with a set of Lifefactory Sippy Caps. These leak resistant caps offer steady flow control ideal for toddlers and older babies who are transitioning away from bottle feeding. Made of the highest quality, thermal shock resistant borosilicate glass from France, Lifefactory bottles offer a healthy alternative to plastics. These bottles are durable and shock resistant and the silicone sleeve provides a tactile gripping surface for little hands and helps protect against the occasional drop. Lifefactory Glass Bottles grow with your baby into childhood--they can be used with the range of Lifefactory nipples, sippy caps and leakproof flat caps--providing years of use. While very durable, Lifefactory bottles are still glass and are not unbreakable. Replacement bottles are available. All Lifefactory bottle components are made in the U.S. or Europe. The Sippy Cap is made in Poland. The silicone valve is made in the USA. All materials are BPA/BPS-free and phthalate-free.