Heavy-Duty Nylap outer fabric is rot-proof and durable; Die-cut for phenomenal 3-D effect that breaks up the blind outline; Durable polyester face net accepts additional materials; Elastic cords prevent wind flap during transport; Install or remove in minutes by simply pulling D-ring pins; Attaches with Velcro closures around aluminum frame; Two nets per blind kit package; 17'-19' is 22' x 60" W to 72" W, tapered to rear