From Birkenstock, the Women's Caris Pro Leather Slip-Resistant Slip On Sneakers feature: Fluid-resistant natural leather upper: The natural leather used has many special characteristics, such as breathability, adaptation to the shape of the foot and durability Certified Occupation Footwear: EN ISO 20347: 2022 OB SR: ASTM F3445-21 SR Adjustable strap with metal pin buckle Elastic gusset and padded heel for added comfort Deep Blue Footbed provides layers of support: layers of cork and cushion, with a moisture-wicking lining to support you through long hours on your feet Slip-resistant PU outsole with tread engineered for safety Imported.