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View of the boots rear entry zipper.

Picture 1 of 3.

All of the A6L designs which I've seen featured a rear entry zipper, extending from the top of the boot to below the top of the sole; the top of the sole incorporated a U-shaped cut-out for the zipper. It is my understanding that, after the molds for the final A6L sole design were created, they were simply modified to omit the cut-out and the same molds were used for the A7L boots.