1-3/4" thick semi-flexible ALECO Heavy-Duty ImpacDor Traffic Door features rubber honey-comb framework and urethane foam insulation. Corrosion-resistant V-cam hinge rotates on a sealed roller bearing. Sealed around the entire perimeter for temperature control in retail and food processing facilities. Rugged ABS facing resists abuse from carts, pallets, or hand trucks. Includes vision panel windows. Made in USA.