These don't melt in the dishwasher, and my daughter even microwaved some milk for cocoa in one (just warmed, NOT hot!). With five kids, I've seen a lot of plastic cups come and go, and these are the best, for several reasons: a. The multicolor pack means each kid has their own color, b. The size holds a perfect serving of drink, and they have a wide base which makes them harder to knock over, and especially c. They hold up well; under constant, daily use, they haven't gotten scratched-up-looking, nor faded, nor gotten that sort of worn-down surface some get from the dishwasher. They look as new as when they came out of the box. Very satisfactory purchase from Overstock.com, yet again!
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