ShelterLogic GrowIT Series Greenhouse-In-A-Box 1-3/8" All steel frame with Dupont thermoset baked-on, powder coat finish will not chip, peel, rust or corrode. 3-rib design delivers ultimate strength, ease of installation, portability and best in category value. Triple-layer, ripstop fabric is 100% waterproof. Enhanced weave polyethylene cover, UV inside and out. Clearview cover provides enhanced illumination designed specifically for plant growth and protection. Patent Pending ShelterLock stablizers ensure rock solid stability. Delivers a stable, more durable shelter. Easy Slide Cross Rail system locks down cover and square up frame. Ratchet Tite tensioning for solid cover anchoring. Bolt together hardware at every roof joint connection.