The Contact Sport Footbed in Blue from Birkenstock.

The skin-friendly BIRKO® CONTACT SPORT insole provides your foot with extra grip during sports and is suitable for flat shoes or those with a low heel. As with the original BIRKENSTOCK footbed, the insole is modeled on the footprint of a healthy foot.

• Footbed lining: microfiber; color: blue
• Length: 1/1
• Sports-friendly, cushioning upper cup
• Stabilizes the feet