Rion Grand Gardener 2 Clear Greenhouse, 8' x 16' Virtually unbreakable 4 mm thick twin-wall polycarbonate roof panels are 100% UV protected and high impact resistant Clear polycarbonate side panels offer classic style without the worry of glass Quick and easy assembly with a simple pin and lock connector system Barn shape design creates high headroom and a larger gardening space Heavy duty resin frame improves insulation and creates extra durability for many years to come