Birkenstock Birki Air 2.0 Clog (Unisex) - Ultra BlueBuilt around the supportive contours of the BIRKENSTOCK footbed, the new Birki Air clog ushers in the next generation of our Professional line. Featuring a fluid resistant design that's been reengineered with breathability in mind, its PU shell helps absorb shock and provide antistatic protection. With all the extras, like a detergent friendly buckle, convertible backstrap and contoured PU footbed to support you through long hours on your feet.