Arena. In 2008, the Volkswagen Arena saw a record attendance. In the same year, a three-storey fan building was built to the northwest of the stadium. In the following year, a number of changes were made in and around the stadium, for example the construction of new training grounds in 2009 and the refurbishment of the box seats, among others, in 2012. The largest expansion in the immediate vicinity of the Volkswagen Arena began in 2013, when the 5,000-capacity AOK Stadium was built next to the arena. This is now used by teams such as the VfL Wolfsburg women's and youth teams. The VfL Center, a new three-storey training centre for the professional football players, was also built. It was initially criticised by some fans. By moving the professional footballers from the Volkswagen Arena into the VfL Center, space was freed up for a chapel as well as for other facilities. The VfL FußballWelt (VfL FootballWorld) opened in 2015 in the immediate vicinity of the Volkswagen Arena, providing space for an interactive exhibition about VfL Wolfsburg. This traces back to the club's football museum from 2004. Characteristics The most striking feature of the stadium is its sophisticated roof, which was designed as a truss-supported membrane structure. 32 radial trusses, each 40 metres in length, make up the support system for the fire-retardant PVC membrane, which is 15,000 square metres large. The membrane is translucent, aims to improve the atmosphere in the stadium for the spectators and supports the natural growth of the grass on the pitch. Seating The Volkswagen Arena is a two-tier stadium with a surrounding promenade. The lower level has an inclination of approximately 25 degrees, the upper level 40 degrees. The ground area of the entire plot is around 115,000 square metres and the floor space of the stadium is around 28,000 square metres. The stadium's capacity of 30,000 consists of 22,000 seats and 8,000 standing places. The standing places can be converted into 4,000 seats. The guest block of the Volkswagen Arena contains 1,886 seats and 900 standing places with separate kiosks and toilet areas. All seats in the Volkswagen Arena are completely covered. A total of 31 boxes with 332 seats are available at the stadium, which also offers 198 so-called Executive Seats, which are integrated into the VIP block, and 1,434 Business Seats with direct access to restaurants. The Volkswagen Arena is home to