Apparel & Accessories > Shoes Shoes > Flats in stock Birkenstock Boston Big Buckle in Mud Green Nubuck, Size IT 37: It’s no secret that Birkenstock has mastered the moldable footbed—and this ’90s-esque clog style does not disappoint. The soft and sculpted suede insole will conform over time to every detail of your feet, and that nubuck upper feels smooth and frictionless. Note the oversize pin buckle on the adjustable strap—a cool update on the OG Bostons. Upper: nubuck leather; Footbed: cork-latex; Footbed lining: suede; Sole: EVA Made in Germany.