BIRKENSTOCK Deep Blue footbed shapes to your foot with wear Natural leather upper Microfiber footbed lining is moisture wicking Natural rubber sole for added traction Footbed made in Germany Heritage inside and out. The new Highwood boot is crafted with the finest natural leather and a BIRKENSTOCK cork PU midsole, hinting at the legendary comfort within. Inside, a premium Deep Blue footbed provides layers of support, with a moisture-wicking lining and PU base that optimizes your natural walking motion. Tread comfortably.