Victorinox Elinox 84mm Solo Sentry - Barbour Welting. What is welting? Well you might learn something new occasionally. A welt is a strip of leather, rubber, or plastic that is stitched to the upper and insole of a shoe, as an attach-point for the sole. Barbour Welting makes these in leather or plastic depending on the construction method. Check them out here at this link, Barbour Welting.