Hydrofarm Lighthouse Controlled Environment, Waterproof Double Layered Tent 4 x 4' Lighthouse will let you grow bigger, taller crops throughout the year Roll up rear door with straps to keep the doors open Duct ports with drawstrings (4" to 9") - 5 on smaller tents Inner lining is 500 D canvas material with dimpled metallic the same as premium units Strong, metal corners