Sun Hut® Fortress® are the most recent line of premium grow tents from Sunlight Supply®. These tents deliver a new innovative design in conjunction with unique product features, enhancing your indoor greenhouse experience. Fortress’ have exceptional quality with superior durability. Comprised of 1680D light tight subject matter with a highly reflective interior surface. The fabric is as much as 9 times thicker than popular industry tents! The frames are extremely robust and include heavy duty reinforced poly propylene connectors that fit securely into our galvanized steel poles. Fortress® tents feature 22 mm poles on most models. The smaller 45, 85 & 90 have 19 mm poles.* Rubberized water-resistant floor helps to contain water spills from escaping outdoor of the tent. Features a removable reflective floor liner, ports for ventilation and cords, two micro-mesh screened ventilation windows and lots of more great features. Note: model numbers identify the approximate cubic feet.