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. - Protective medical-grade silicone sleeve provides a tactile non-slip gripping surface and helps prevent breakage - While very durable, our bottles are still glass and are not unbreakable - Dishwasher safe (place cap parts and nipple on top rack/no need to remove silicone sleeve unless desired) - As baby grows we offer a range of caps (sippy and flat) to extend the life of your bottle - Includes polypropylene (PP#5) cap, ring and stopper and silicone nipple - Compatible with most major breast pumps - All components are made in the U.S. or Europe - Product assembled in the U.S. - All materials are FDA approved - BPA/BPS-free and phthalate-free - 9 oz (250 ml) with Stage 2 (3-6 mos) nipple ____________________________________________ Sippy Caps -Great for toddlers, our sippy caps are leak resistant and have steady flow control. -Our 2-pack of caps quickly converts 4 oz and 9 oz baby bottles into sippy cap bottles as your child grows. -BPA/BPS-free, phthalate-free and dishwasher safe. -PP cap made in Poland. Silicone valve made in the U.S.