<P> A pair of nearly 300 ft (91 m) - tall arches spans the length of the stadium dome, anchored to the ground at each end . The new stadium also includes "more than 3,000 Sony LCD displays throughout the luxury suites, concourses, concession areas and more, offering fans viewing options that extend beyond the action on the field". It also houses a center - hung Mitsubishi video display board that was the largest high - definition television screen in the world at the time of their installation . It has since been surpassed in size by the Panasonic "Big Hoss" video board (218 feet (66 m) wide and 94.6 feet (28.8 m) tall) at Texas Motor Speedway . Glass doors, allowing each end zone to be opened, were designed and constructed by Dallas - based Haley - Greer glass systems . </P> <P> The retractable roof was designed by structural engineering firm Walter P Moore and the systems were implemented by mechanization consultants Uni-Systems . The electrification of Cowboys Stadium's retractable roof was developed by VAHLE, Inc . These Kinetic Architecture fundamentals will be employed in order to create quick conversions of the facility to accommodate a variety of events . When the design was officially unveiled on December 12, 2006, it showed that, from inside the stadium, the roof (membrane installed by K Post Company of Dallas) will look very similar to the Texas Stadium roof, with its trademark hole . However, it can be covered by the retractable roof panel to protect against the elements . </P> <P> The football turf field was built by Hellas Construction . They developed a special SoftTop Convertible Turf System that has 26 interchangeable panels to allow the stadium to host a variety of events from concerts, dirt bike and monster truck rallys to college football, basketball, and soccer games . </P> <P> A Dallas Cowboys Hall of Fame is planned for the Hall of Fame level . The drawings also include a site for a large sculpture northeast of the stadium, close to Randol Mill Road . </P>

What kind of turf is at at&t stadium
find me the text answering this question