Arch Support generally refers to the part of the insole of the shoe that raises right at the level of the arch to provide support to the midfoot. Arch Support also refers to individual insole cups with a molded shape that fit the arch and are placed inside the shoe to help relieve foot or heel pain.
About Moccasins:
Moccasins are shoes typically made of soft leather or suede. Moccasins have a sole characterized by being soft and flexible and an upper that may be adorned with embroidery, beading, ties, or other ornament as decoration.