So far the balls "seem" to work minimally and they were on sale so don't complain too loudly . I don't understand what "hot" is in hot/cold massage therapy balls, I bought them because it sounded like the heat would be nice, maybe after heating in the microwave BUT once you open the box and the instructions read, it is so will teach you. Heat them under "warm" (not hot!) water, don't microwave or they will be damaged, as one reviewer found out I think. The heat at the tips of the porcupine balls is gone when you put them down and of course ANY heat is gone after rolling on a non-slip surface and your foot. SPRI should refer to these items as HOT/COLD massage balls in order not to mislead the customer.
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