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 Sandals:
An open type of shoe that consists of a sole fastened by straps to the foot. Types of sandals include espadrilles, flip-flops, strappy sandals, and thong sandals.
About Slingbacks:
Slingbacks are a type in shoe in which the heel is exposed yet is contained or secured by a strap that sits above the heel around the ankle.