I LOVE, LOVE, LOVE these mugs. They are fragile, but not half as much as many of the other brands I’ve owned and broke/cracked. I always hand wash these and dry right away. They are glass after all and if dinged or put down on hard surface carelessly they will break. What I love most about these mugs is how they keep my coffee temperature warmer for longer periods of time and just how lightweight they are compared to regular glass coffee mugs.