A Goodyear welt is a strip of leather that runs along the perimeter of a shoe outsole. The welt is sewn separately to the upper and the sole. Time-consuming by modern standards, Goodyear welted construction is still considered one of the finest methods of shoe construction that gives the benefits of repairability, durability and comfort.
Analogous to the Goodyear Welted construction method, the welt is sewn separately to the upper and the sole. In this case, the sole is made of rubber which ensures higher degree of durability and water-proofness.
The upper is directly stitched to the sole, resulting in lighter shoes both in appearance and weight, with greater flexibility.
The rubber soles provide extra grip in exchange for less breathability. Not as stiff as leather, rubber can be a popular option when repairs are needed on less formal shoes.
The sole is simply glued onto a shoe and that is a cemented sole construction. Due to the lack of a welt or the need to stitch the sole, cemented shoes tend to have more delicate looking soles.
Moccasin construction is where the shoe is made from a single piece of leather that stretches all around the foot and is fastened at the top. This seamless method allows for little or no extra sole to be required, making them extremely supple and lightweight.