The BIRKENSTOCK Boston model is a true classic that can be worn without any problems all year round. Thanks to its refined, individually adaptable design, the Boston has long been a legend. This slipper which, once worn, recalls the lightness of cork sandals, is made of particularly light and very flexible EVA plastic. The high-quality EVA plastic, odorless and free of harmful substances, combines many positive characteristics: it is very light, extremely elastic, shock-absorbing, water-resistant and skin-friendly.