The galvanised wire hoops are built into the coverand the tunnels fold away concertina-style for easy storage. Drawstring feature enables open or closed ends for ventilation or maximum protection. Strong, white polypropylene fleece, to protect against frost (to -5°C), harsh weather, pests, but allows air, light and some water through.  Available in two sizes: Standard - Length 3m (10\'), Width 45cm (18), Height 30cm (12). Giant - Length 3m (10\'), Width 60cm (24), Height 45cm (18).