The new Sonik SK-TEK 2-Man Bivvy is made of 5,000 mm waterproof polyester with polyurethane backing and is made of lightweight 5-piece poles. The Bivvy is part of the amazing Sonik SK-TEK range, offering practical, durable and inexpensive products for todays anglers. SPECIFICATION 5,000mm HH 210 PU Coated Polyester Lightweight 5 Section 16mm 6061 Aluminum Poles Large Umbrella to Protect Doors Tuff-lite Removable Groundsheet Maximum Space Rod Layout and Inline Tensioning Rods 2 Way Letterbox Design Removable Door 3 Door Window Options (Green Clear PVC Mozzi Net) Large Opening for front and back.