Safe MaterialMade of high quality food grade double-wall 18/8 stainless steeland the inner wall is smooth.it's anti-corrosion and rust prevention.The lid of the cup adopts a silicone sealing ring, which is safe and leak-proof sealing, which can resist high temperature and prevent aging.100% BPA Free. Keep Your Drinking Hot & Cold Used the vacuum-seal technology and double-wall construction, vacuum insulation for maximum temperature retention, Gloss coated brushed stainless steel outside,keeping drinks cold for as long as 12hrs and hot for 12hrs .Easy to grip and drink on the go . NO LeaksThe cup comes with a safety lock to avoid accidentally opening the lid .push-button cover that snaps closed to prevent leaks and spills and locks the lid back when open for easy drinking.button lock prevents accidental pressing button for added peace of mind .Its also aids in keeping beverages heated or chilled longer. Makes a Great Gift For AnyoneThis travel thermos makes a great gift for holidays,outdoorsy people, coffee or tea lovers. It is very convenient to carry in daily life,too.such as running, driving, reading, and walking the doggym, yoga or outdoors hiking, biking. CARENot applicable to dishwashers.must be hand washed . Any question you could message us. || Flask Travel Mug Water Bottle Travel Mugs for Hot Drinks Coffee