The first types of iPod skins cover the existing structure of the iPod and provided added protection to its fragile LCD screen and brittle plastic case.  One of the most popular of these products is the Carbon Fiber iPod case.  Essentially you buy a package of two laser cut pieces of carbon fiber which you affix to the front and back of your video iPod with the supplied set of four stainless steel screws.  Also included in the package is a steel belt clip so you can carry your carbon fiber incased video iPod clipped neatly on your belt or just inside one of your pants pockets.  From another company manufacturing iPod skins comes the TuffWrap.  This is a skin made from silicone which completely wraps your iPod, leaving only the LCD and the control wheel free.  With the TuffWrap you get the protective value of Apple products like their Italian leather case and iPod sock with the ability to still see any videos and control any play lists on your player.