The Solebox x Torsion Allegra retro running shoe was a collaboration between adidas and Berlin brand Solebox, introduced in December 2012. It pays homage to the original Torsion Allegra from the 90s, maintaining key features such as the neoprene bootie design and the Torsion crossbar for enhanced energy transfer. The shoe also includes a mesh inlay and toe box to promote airflow, ensuring the foot remains cool and dry. Additionally, the use of suede and TPU overlays provides added structure and stability, ensuring each stride maintains its integrity.