Sun Hut? Fortress? are the newest line of premium grow tents from Sunlight Supply?. These tents deliver a new innovative design along with unique product features, enhancing your indoor greenhouse experience. Fortress? have exceptional quality with superior durability. Constructed from 1680D light tight material with a highly reflective interior surface. The material is up to 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 waterproof floor helps to contain water spills from escaping outside of the tent. Includes a removable reflective floor liner, ports for ventilation and cords, two micro-mesh screened ventilation windows and many more great features. Note: model numbers identify the approximate cubic feet.