The Indigo is an igloo shaped dog house from Petmate that sports an extended doorway to keep the sun, rain and snow at bay and to provide extra lounging space for your dog. To improve heat regulation, the Indigo is made from structural foam and has adjustable top ventilation. Optional accessories include a nylon floor pad and a flap door. This model is made for medium, large, and extra large dogs.
Some advantages of the Indigo: the structural foam is easy to clean, it won't rot, and it prevents fleas from nesting. It's also low maintenance - just an occasional hosing down. The Indigo is also lightweight so it's no problem for one person to move it around to different locations in the yard.
Source:
http://all-about-dog-houses.com/docs/term/indigo-dog-house.htm
