Rion EcoGrow 2 Twin Wall Greenhouse, 6' x 8' Heavy duty 100% UV-protected resin frame Easy pin and lock connector assembly - no special tools required 4mm UV-protected twin-wall polycarbonate roof panels provide diffuse light for plants 6 mm twin-wall polycarbonate side walls provide extra durability, 100% UV protection and high impact resistance Barn shape design has high headroom for comfortable gardening