Birkenstock Birkobasic Footbed (#BIRKW) - One PairBirkenstock Birkobasic Footbed (#BIRKW) One Pair BirkoBasic , the footbed insole with a BirkoTex lining, is a relaxing insole for leisure and occupational footwear. The insole combines the generally hard and flat insoles of conventional footwear with the anatomical shape of the foot. The foot is stabilized in its natural position. Anatomically shaped footbed Discreet support Soft BirkoTex lining For leisure shoes, occupational footwear, hiking shoes