The 1680D Diamond Reflective Walls are 3-9X thicker than any other grow tent which makes them light proof, odor resistant, quieter, and properly insulated. Gorilla tents also have the strongest metal poles that can hold up to 500lbs on larger sizes for maximum safety and security. Other highlights include a patent pending InfraRed blocking roof, double-cinching ducting ports properly positioned where they should be, heaviest duty zippers that last, durable safety pool for unexpected water spills, and large EZ View windows that offer easy grow snapshots without compromising your environment. The doorways also zip all the way around that offer complete 360 degree convenient access. The larger layouts provide frustration free maneuvering. Exterior dimensions: 4? x 4? x 6? 11? (w/ ext. 7? 11?)