Review on 4-Pack Double Wall Glass Coffee Mugs With Big Handle, 380Ml (12.9OZ.), Clear For Latte, Iced Coffee Or Hot Beverages - PunPun Espresso Cups by Doug Mancilla

These mugs are decent, and the glass provides some insulation to keep drinks hot a bit longer (but not much). The biggest problem is that after about 2 weeks, one of the mugs developed a lot of consensation between the two glass walls (see pic), and now has a large amount of standing water trapped inside. The small hole in the bottom allowed moisture to enter but is not large enough to allow it to evaporate. We will throw this mug away - hopefully the other 3 will last a little longer.EDIT: After another couple of weeks, now 3 of the 4 mugs have large amounts of water inside the walls of the mugs.