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This is a hand-blown borosilicate glass tumbler with double walls, a silicone-sealed lid and a silicone sleeve and base. The double wall insulates hot and cold drinks while the outside stays comfortable to hold, and borosilicate resists thermal shock, so boiling water or a freezer-to-oven move won't crack it. It suits slow sippers who want to see their tea or coffee and avoid plastic and metal tastes. Against stainless steel travel mugs it trades hours of heat retention and ruggedness for a clean taste, visibility and a comfortable outer wall; it is still glass, so it can break. Owners rate it highly, and the main cautions are fragility and the fact that it is not a sealed travel mug.
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Lowest price we've seen: $19.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners rate it very highly and praise the insulation, the comfortable outer wall and the clean taste of an all-glass cup. The recurring caution is that it is glass and needs care.
This is a 14-ounce double wall tumbler made from hand blown borosilicate glass. It comes with a lid and is meant for hot or cold tea and coffee. Borosilicate glass resists thermal shock, so it will not crack under extreme temperature changes the way regular glass can. Hot water can be poured into it.
The double layer of glass insulates the drink, keeping it hot or cold longer. The outside stays comfortable to hold. Borosilicate glass is hypoallergenic, lead-free and BPA-free. It is still glass and can break, but it tends to snap into larger pieces rather than splinter.
Food-grade silicone is used in three places. A silicone seal helps prevent leaks while drinking, a silicone sleeve gives a non-slip grip, and a silicone base protects the glass on the bottom.
