The Ozeri Serafino insulated glasses hold approximately 8 ounces of liquid. These unique shaped glasses are made of heat and shatter resistant borosilicate glass. Borosilicate glass does still break so do not think these glasses will never break. If the glass is placed in the freezer and you pour hot coffee in it the glass will break. The glass cannot take a drastic temperature change, but it can take slight temperature changes. Each of the glasses sport a wraparound contour that makes them easy to grip. The glasses are design to keep the heat and cold from your hands. These glasses also were designed to be free of condensation while you drink your chilled beverages. The glasses are microwave safe, which is nice for reheating my coffee. The thing I like the most is that they can go into the freezer and then I can pour my tea or ice coffee into the cup then enjoy a frosty icy summer beverage.
Overall, I found the Ozeri Serafino Double Wall Insulated Beverage to be well made. I would not say they will never break and you may want to make sure that you do not toss them into the sink. Though, I have had no issues. I like the idea of using the glass glasses since I do not have to worry about the BPA in the plastics or other chemical that can be found in the plastics. I also like that the glasses are clear it makes for a great presentation when placing them on the table for dinner. I tested the glasses in the freezer and microwave. In each test the glasses preformed as they were intended. The outside of the glass does have a slight temperature change when adding the different beverages, though nothing like a normal glass. Hot coffee is only slightly warm and ice cold tea is only slightly cold. Both of the temperature changes to the glasses were very comfortable to hold. I found that the beverages stayed hot or cold longer than when in other similar insulated cups. I found no irregularities or defects in the glasses. I received this product as a sample and my findings are based on my own impressions of the product. In no way was my finding influenced by my sample.
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