Women's Birkenstock Arizona Essentials Eva Sandals - Black - Flat sandals 100% waterproof construction. Ultra-lightweight. Two straps, each with an individually adjustable metal tongue buckle for the perfect fit every time. Iconic EVA BIRKENSTOCK footbed is comfortable and offers all-day support. Deep heel cup supports the foot tissue and holds the heel bone firmly in its natural position. Heel mould activates the calf muscles, stabilizes the back of the foot, and improves gait and coordination. Added support for the interior and exterior arch. Transverse arch support runs through the middle of the footbed and stabilizes the metatarsal bone for a solid stance. Raised indentations at the front of the footbed ensure that the toes remain loose and spread out in their natural position. Drawn up footbed protects the toes during the rolling motion of the foot. Microfiber footbed lining for increased comfort. High-quality, lightweight EVA outsole provides enhanced cushioning and smooths out slight irregularities in the floor.