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 Loafers:
Loafers or penny loafers are low, leather step-in shoes with tops that resemble moccasins, but have broad flat heels. Loafers have no shoelaces or buckles. Penny loafers are made of leather and are often worn for formal occasions.