Hmm hot foot.... Which one's does she have? The hydro style can get dunked into the water- so if your foot gets hot I just get it wet. But I do know what she means about it getting hot...But I got used to it and it didn't bother me. My kids never complained about it in Disney(3 of them in Keens-no baby size yet...) they never mentioned the hot foot, but I did. Good luck. what about a cooling foot spray- or powder?