Here's a link to Medicool. http://www.medicool.com/diabetes/dia...protectall.php
I've used their products to keep my insulin cool. I've worn out four or five of these. I take it everywhere I go. Edit: But I don't wear it on my belt. I carry it, and if I have to put it down at a friends home or somewhere else, I always put my keys in it. That way, I can't leave without it.