Blake Stitch: Blake construction is created by directly stitching the outer sole to the insole, providing maximum flexibility and a light weight to the shoe. The Blake Rapid construction is pretty much made in the same fashion, except that there is a mid-sole (as shown in the top picture) that is connected to the outer sole as well as the insole, providing a little bit more cushion to your foot.
Goodyear Welt: The “welt” is a strip of leather which is sewn around the bottom edge of a shoe. This stitching (the welt seam) attaches the welt to both the insole and the upper of the shoe. The welt is folded out to form a point of attachment for the outer sole. The outer sole (two layers can be used in heavier shoes) is sewn to the welt, with a heavy-duty lock-stitch seam.