The BirkoNatural Footbed from Birkenstock.

BirkoNatural - this footbed is wonderful for your feet and is natural, too. The footbed contains natural and renewable resources (e.g. cork, leather, jute). The foot-friendly, anatomically shaped footbed naturally cushions and supports the foot. BirkoNatural puts a spring in your every step and reduces the strain on the spine, knees, and hips. Its length means this insole will fit into most types of footwear.

• Vegetable-tanned leather lining
• Cork-latex insole
• For flat shoes, leisure shoes, occupational footwear, boots, pumps with a low heel, hiking shoes