As the strongest greenhouse on the market, RIGA is the most popular german greenhouse with super sturdy and durable for over 20 years of usage. It is made of heavy gauge extruded aluminum with a 10mm polycarbonate panel and a special onion shade design. You will have no leaves or debris collecting on the roof, and larger space for large plants and palm trees. It is also the most effective greenhouse during winter and against up to 100mph wind speed and 180PSF snow load.