Glass-free; Lightweight yet strong 4-millimetre UV twin wall polycarbonate panels provide excellent heat retention and diffuse even sunlight New and improved instruction manual for 2018, integrated rain gutters for water collection and roof window for ventilation Strong frame; Made from durable, rustproof aluminium that is low maintenance and doesn't require paint or treatment Sliding door; The sliding door design wont slam shut in strong winds and maximises usable space Garden Grow Greenhouse | Living Social | Living Social