There are over 800 known ways to make a shoe, but most are variations of a few basic methods or constructions. The term sole construction is simply the method used to attach the sole to the upper of safety footwear.
The most common constructions for safety footwear are:
Goodyear Welt Construction: This method is considered the traditional construction for sturdy, well-made footwear. It is used almost exclusively on better shoes and most men’s shoes. Goodyear Welt Construction uses an insole with a wall or rib that is positioned close to the edge of the insole. During lasting, the upper is secured to this wall. The welt is then sewn in and attaches to the wall of the insole. The sole is then positioned with an adhesive to the shoe bottom and is stitched through the welt. This creates an indirect attachment since the sole is not directly attached to the upper. This is among the most labor intensive methods of shoemaking, and thus the most expensive.