These double wall coffee glasses really do keep your fingers from getting hot. The glasses themselves can hold at least 10 oz of coffee before adding any additional creamer and sugar. Considering they're double walled, the outer wall stays cool to the touch while keeping the hot contents away. I have placed them in the dishwasher on the top rack, and they wash perfectly. So far, there's been no breakage, no water getting in between the walls. These are perfect for people who enjoy a nice hot beverage without getting their hands or their fingers hot while holding it.