Virtual Sun VS4800-48 Indoor Grow Tent, 48-Inch x 48-Inch x 78-Inch Exterior material: heavy duty 600d oxford cloth. inner lining material: 100% highly reflective water-proof mylar. Frame material: firm powder coated metal. removable reflective floor pan. Built-in large door for setting up lighting system and moving plants in or out. built-in zippers for easily setup and take down Removable roof cross members make it easy to adjust lights and accessories 3 - (24 x 8-inch) lower ventilation slots that can be covered or opened. 2 - (3-inch diameter) utility slots. 2 - (6-inch) diameter ventilation slot.