Tatami by Birkenstock Oklahoma clog cork/latex footbed molds to the shape of your foot. The wide toe area keeps your feet in correct alignment. Neutral heel properly distributes your body weight. Cushioned heel cup.It’s time to broaden your understanding of the Birkenstock family of brands. Take the Tatami Oklahoma clog, for instance. The shape and comfort features are true to the parent brand, but the stitching and hardware are features specific to the Tatami name.