NOT shatterproof

I'm a big coffee drinker, so I bought these mugs thinking they were the perfect size for a good cup. So far, I've had 4 of the 6 shatter on me. As in explode for absolutely no reason. I generally ignore my dishwasher and hand wash everything, so I can verify that none of them had hairline cracks or chips prior to shattering on me, but they do tend to explode with just hot coffee in them. Not boiling, just hot. Attractive or not, I definitely wouldn't buy them again. My startle reflex has been tested one time too many for my taste..

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