Ultra Flex Air System features air ducts to provide ventilation

Extra Comfort

- Rubber outsole with 10% recycled rubber

Frame Material: Injected

Lumen has an exterior pocket with a leather tassel zipper pull and a slip pocket for your phone

BIRKENSTOCK COTTON TWIST WOMEN'S Size:M Ultra Flex Air System featuresThis casual & soft, skin friendly cotton sock is perfect to be worn with sandals, clogs or shoes! The reinforced toe and heel sections offer lasting comfort by boosting durability and providing the feet with optimum protection. High cotton content for maximum comfort Components: 96% cotton, 2% polyamide, 2% elastane Upper material: Material combination For this sock, a combination of materials was used. You can find more information on our main