Sizing: Regular shape, please choose your usual size. If you are a half size, please order up. For more details see the Size Guide. Upper: Ecological microfiber, a water resistant material. The zipper is metallic and free of nickel. Lining: Breathable and anti-allergic microfiber, CO2 free manufacturing system. Insole: Paperboard agglomerate, microfiber linned. Footbed not removable. Outsole: Non-slip rubber, 3,5 cm/1.3 in. Made in Portugal.