Loved them and ripped the package open, but they were just too big. Exchanging for the exact same but smaller size. I think what it is: the base of the heel fits snug but in order to be the comfy slide-ons, the rest is very soft. I also have wide feet, so these provide plenty of room of you do, too! A little arch support as well, for thin-sock wearers to feel too! Even having said all of this, I recommend you size down.I can see how they might be hot in the dead heat of summer and maybe late…