More after the break.
" The Aeris Rail+ is the first polymer iPhone case that is completely customizable. It is actually a modular case that serves as the main part to which you can attach many other Aeris accessories. This means you can modify your case as little or as much as you want based on the activity you are planning. For instance: Need to have the phone upright for Face Time or to watch YouTube vids, simply attach the Kickstand. If you plan to do some camping and want extra protection for your iPhone, attach the sliding front and back Visor cover to keep it safe from the elements. Best of all, the Rail System is able to accommodate future accessories and easily integrate the iPhone into your daily life. All this is possible due to the Aeris Rail system! "
The review of the Aluminum Rail here.