The BIRKENSTOCK Solana merges the stability of a closed shoe with the lightness of a sandal. Featuring closed sides with an open toe and heel, the design allows for airflow. A hook-and-loop fastener provides adjustable support. The construction includes a shearling-lined footbed and fastener, with an upper crafted from soft suede. anatomically shaped cork-latex suede with shearling lining shearling footbed lining EVA sole individually adjustable fastener