The competition for the extension of the speed skating hall at the Sportforum Berlin has been decided – 4a Architekten have received a recognition. In the future, the new building is to ensure training for top athletes in the field of winter sports. The 4a design is a three-storey L-shaped structure with a light and dynamic design that fits naturally into the existing situation between the top sports training centre and the training hall complex. A striking design feature is the curtain-type textile façade, which envelops both the new building and all the existing rooms, giving the building a uniform and identity-creating appearance.