Silicone Skin Pouch For Nike+ iPod and Nike Plus Nike+ SportBand - Compatible with all Shoes- Dark Blue
It is a great pouch.  The first time it is a little difficult to put the chip in, but once you get to know the pouch it becomes really easy.  I have two pairs of shoes (two pouches) and one chip and rotate my shoes every week.  Switching the chip is really easy and only takes me a minute.  Lacing it up it is also simple if you just check the pictures on how it has to be laced up.  Unfortunately I have not tested in rain or snow yet, but by experience I can tell you that the possibilities of your chip gettin