Made of double wall borosilicate glass. Thanks to the insulation layer, the external glass never gets hot. Plus, it keeps your drink hot or cold for longer. Leakproof, rustproof and odor free. -Premium construction stainless steel water bottle infuser and lids, 100% BPA free. No stale odors! -It can be used for green, black, white, matcha tea leaves and more, herbs and fruit infused water. -Elegant design, perfect gift idea! -Holds approximately 16 fluid ounces