High Growth Efficiency : Perfect light blocking and uses 99% highly reflective waterproof mylar to boost the output efficiency of any grow tent setup. Duarable : The superior quality 600D canvas is tear proof and double stitched for blocks all light from escaping ; the canvas is reinforced by the metal poles to ensure the security and stability. Updated Design: High quality zipper can protect the tent from light leaking and ensure durability and long-lasting use. We've gone to great lengths to ensure our heavy-duty metal zipper is the best on the market. Easily Observed : Our easy-access door can be opened smoothly, and the observation window makes it easy to view the interior and observe plant growth. Fast Installation : Easy to install without tools even if you've never done something like this before.