The frosty mug have double walls, it is made from Acrylic(sterile &innocuous material).There is some Special-purpose coolant between, it is two walls, after frozen, the coolant came into the soft ice cream shape, and the expansion coefficient is small, not bulge lead to vessel broken, so that the mug is safe & non-toxic.
First, keep the cup in the refrigerator and let upside down before being put into use, after 2-4 hours.It could be OK for use when It is coolant had changed from liquid to solidify, input your favor drink. It can be cooled down to or so -5°C in a torrid summer, the drink can be keep about 2.5 hours in that sustained refrigeration condition. It will not loss it is original color, quality, taste and purity ,It is suitable to the need of the human body is heat cycle exchanges.
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