Construction method where an interlocking stitch is used to attach the upper, insole and outsole in a single step. The outsole is channelled to accommodate the external stitch, and then closed during finishing.
Double Sole Blake or welt + sole:
Construction where the above method is used to attach the upper/insole combination to a double leather sole (midsole and the outsole) or a welt/outsole in a single step.
Construction where the upper/insole combination is stitched to a midsole via the Blake method (internal stitch), and to this base the outsole is attached using a separate interlocking stitch run outside the margin of the uppers. In this case, the result can be either open channel or closed channel in regards to the outsole finishing.