BIRKENSTOCK Boston Mules Juniors. Iconic model from Birkenstock, the Boston clogs can be worn all year round and provide excellent foot protection for children. The upper is made from Birko-Flor®, a soft synthetic material that resembles the elegant look of nubuck, with a texture and colour very similar to genuine leather.Anatomical footbed made of cork and latex. Upper: Birko-Flor® nubuck. Insole: suede leather. Outsole: EVA. Details: adjustable strap with a metal pin buckle. “Made in Germany”. These BIRKENSTOCK Boston kids' clogs combine classic style with all-day comfort. These durable stone coloured slip-ons feature an slip-on profile with an iconic cork footbed. Summer holidays or at-home style made easy for fashion-forward kids.