Birknstock Birko Sport Two Part insole.

• Birko Sport, the 2-component insole for the extreme stresses of sport, establishes ideal contact between the insoles of conventional sports footwear and the anatomical form of the foot
• The foot is naturally supported and guided when standing, walking, and running.
• The shock absorbing properties of the material brings you relaxed running comfort and more enjoyment of your sporting activities.
• Style no. 1001113