ECCO Women's Biom Delta Offroad Athletic Sandal 100% Yak Nubuck Leather/Textile Imported Rubber sole Speed lace system for an easy fit and plenty of adjustability Combination of Yak leather and mesh upper TPE footbed offers excellent long term cushioning BIOM technology has low-to-the-ground construction which provides a natural foot position Durable rubber outsole for outstanding grip and traction on varied terrain