VIVOSUN 48"x48"x80" Mylar Hydroponic Grow Tent with Observation Window and Floor Tray for Indoor Plant Growing 4' x4' KEEPS ALL LIGHT IN: The VIVOSUN grow tent blocks all light from escaping and is lined with 98%-reflective mylar to boost the output efficiency of any grow tent setup. EXTRA-THICK CANVAS, STANDS STURDY: The top-quality 600D canvas is tear proof and double stitched for perfect light blocking; the canvas is supported by strong metal poles that are specially finished for smooth installation. ATTENTION TO DETAIL: Little is more annoying than a low-quality zipper, so we've gone to great lengths to ensure our heavy-duty metal zipper is the best on the market. EASY OBSERVATION OF YOUR PLANTS: Don't throw out your back checking on your plants! Our easy-access door unzips smoothly, and the observation window makes it easy to peek inside. FAST INSTALLATION: VIVOSUN grow tents are easy to install even if you've never done something like this before: no tools needed! Quality backed by our ironclad, hassle-free 2-year warranty.