Wear is not a defect, and the distinction matters because the three-year legal guarantee covers one and not the other. Some concrete examples:
Normal wear, not covered: the suede nap has gone flat and shiny; the sole has thinned under the ball of the foot; the canvas has softened and stretched; the satin on a latin shoe has scuffed at the toe; the elastic has slackened after a season.
A defect, covered: the sole has come unglued from the upper; a split-sole pad has torn away at its stitched edge; the upper has split along a seam under ordinary use; a buckle has snapped; the two shoes of a pair are visibly different sizes.
The guarantee page sets out how to make a claim and what we do about it.