The galvanised wire hoops are built into the cover, & the tunnels fold away concertina-style for easy storage. Drawstring feature enables open or closed ends for ventilation or maximum protection. UV stabilised clear polythene gives complete weather protection & makes the most of spring sunshine to warm the soil & bring crops on quickly. Giant Size 3m Tunnel: Length 3m (10'), Width 60cm (24), Height 45cm (18).