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. Zipper with black lining create a light-proof seal without the need for additional flaps and self-adhesive tape | EXTRA-THICK, STANDS STURDY: The top-quality 340g oxford is tear proof and double stitched for perfect light blocking; Lined with non-toxic PE material, it is more safe for your plant, and the tent is supported by strong metal poles that are specially finished for smooth installation | 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 without disturbing your set-up | FAST INSTALLATION: VIVOSUN grow tents are easy to install even if you've never done something like this before: no tools needed! Unrivaled craftsmanship and materials make VIVOSUN's grow tent the best choice for professional growers | VIVOSUN'S QUALITY ASSURANCE: We pride ourselves on outstanding customer care. We have the best selection of grow tent sizes at affordable prices. If you have any issue please do not hesitate to contact our customer service