TMG Heavy Series™ 30' x 40' Light Deprivation Two Layer Cover Greenhouse Grow Tent, 6-mil Blackout Tarp and Clear Film, Cold Frame, Hand Crank Roll-Up Sides, Peak Ceiling Roof, TMG-GHD3040The TMG GHD3040 Light Deprivation Two Layer Greenhouse Grow Tent is a sleek, professional, year round growing structure perfect for any type of grower. Two layers of cover protect your sprouts, seedlings and flowers from the elements and harness the seasons completely while still allowing direct sunlight to diffuse through for warmth and optimal growing conditions. This greenhouse is built to create a strong, stable and long lasting solution for