Super large where the mouse could slide all around. I did find a New Balance pair of slides for about $35 on Amazon that seem excellent with good arches. Inclines/uneven terrain aside, the shoes have a comfort level of "okay. I hope they keep this style forever. Not Nike quality that you come to expect. Jad to get another cable that fit to charge the device. I wouldnt say they are the very best quality or that they look super nicely made but for the price they are cute enough and a fun little slipper. If I go with the G915 it will either be because I cant past having an extra wire on my desk (and right now the G915 is probably the best wireless option with backlit keys unless you want to take a chance on a Hexgears Venture) or because I find myself unable to adapt to full height keys anymore after using laptop keyboards for so long. Simply a waste of time, money and Disappointment. That is minor aesthetics, but it could also be one of the reasons they are so loud.