Keeps All Light In: VIVOSUN Hydroponic Mylar Grow Tent blocks all light from escaping and is lined with 100%-reflective mylar to boost the output efficiency of your setup; No need for additional flaps or tape, just zipper the black lining to create a lightproof seal Extra-Thick, Stands Sturdy: Supported with strong metal poles, the quality 340 g Oxford fabric tent is tear-proof and double-stitched for perfect light blockage, while the inside is lined with non-toxic PE material that's safer for your plants Easy Observation: Don't throw out your back bending over to check on your plants; Our easy-access door unzips smoothly, and the observation window makes it easy to peek inside without disturbing your setup Fast Installation: Our grow tents are easy to install even if you've never done anything like it before: no tools needed; Unrivaled craftsmanship and materials make VIVOSUN's Hydroponic Mylar Grow Tent the excellent choice for professional and amateur growers alike More Options, Simple Assembly: We pride ourselves on delivering a selection of grow tents at various sizes; With the guidance of the manual, you can assemble the tent in a matter of minutes