The RS-C100 Rain Slicker is custom-fit to the Canon EOS C100 Camera.  The Rain Slicker is constructed using Nylon Taslan material that is both waterproof (1000MM waterproof rating) and breathable (1000G/M² breathability rating) to protect the camera from water and dust, and also allow the heat given off by the camera to escape.  
There are clear vinyl windows that provide the camera operator with unobstructed views of the controls and viewfinder.  Access to the camera from the bottom of the Rain Slicker allows the camera to be used on a tripod or hand-held position.  
 
Watch this quick instructional video about putting on a Portabrace Rain Slicker on your camera.