Your shoe has been crafted using a Reversa construction. The Reversa construction does not use any glue between the upper and sole. The upper is directly sewn to the sole inside out and turned over (Reversa) through a manual operation by our shoe craftsmen. Your shoe is unique, each pair and each individual shoe is handled manually, and may have slight imperfections between the upper and sole and possibly a slight cracking movement linked to a completely unstructured construction.