Retractable roofs offer different features atop football stadiums across the country. They are made of materials ranging from translucent fiberglass at Reliant Stadium, in Houston, to metal and fabric. Designers originally considered a retractable-roof design for the Mile High stadium as Denver looks to attract the Super Bowl, but those initial plans would add $150 million to the cost compared with building an open-air stadium, said architect Curtis Fentress, and a Broncos spokesman said the team is not considering that option.

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The Denver Post

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