This is a grain leather that has been slightly brushed on the surface to create a very fine velvet-like appearance. The texture of nubuck is finer than suede.
About Strappy Sandals:
Strappy Sandals are sandals that are characterized by multiple straps covering the toe and/or heel. The straps on strappy sandals can be used to secure the shoe to the foot or some of them may be more for ornamentation.