Foldable is a Great Concept [SEP] Easy to use and easy to store are two of the best features this product has going for it. The bubbles are nice as well.<br /><br />The heating element gets EXTREMELY hot and is easy to brush up against if you have large feet.<br /><br />The shiatsu rollers are do-it-yourself, so you have to move your feet to get any benefit, again, increasing the likelihood of touching the heating element if you have big feet.<br /><br />Good idea, but needs a redesign.