My husband and I love drinking coffee in the morning and tea at night. These mugs couldn't be any better. We just LOVE how you can see what you are drinking! They are made out of glass, but they are still lightweight. And they don't feel fragile at all. I do wash them by hand, though. The outside of the mug doesn't stay completely cool, but it doesn't get as hot as a regular mug either. I think it's going to be perfect to keep my hands warm during the winter months. I'm pleased with them!