The extra large shoe factories that makes shoes for a big brand like Nike or Adidas Reebok or Under Armour may have many lines in one complex. When I say complex I mean huge property. I’ve worked at a factory with 40 production lines and 20,000 workers with a capacity to produce approximately 20 million pairs of footwear annually. The site has 20 buildings and site covers approximately 500,000 square meters.