MEN ATACAMA SANDAL Color - FUTURA ELEMENTAL BLUE. The BIRKENSTOCK Atacama sandals feature hook-and-loop fasteners instead of traditional pin buckles and reinforced heel support for added durability. The polyurethane sole is designed with two layers for maximum flexibility and grip. Made from Birko-Flor®, a durable and skin-friendly synthetic material, these sandals are ideal for active users. This model is a variation of the classic Arizona, suitable for all-day wear.