ECCO. 810664-02072. BIOM DELTA FISHERMAN. COFFEE. From city streets to mountain hikes this lightweight closed-toe sandal will take you everywhere in comfort. We ve used our robust ECCO YAK nubuck leather to ensure it s durable enough for outdoor adventures. FLUIDFORM and BIOM NATURAL MOTION Technologies combine to promote comfortable wear by cradling the foot and cushioning as you walk. The sporty style is enhanced with a speed-lace system for a quick and easy fit.