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These hard to find extra large diameter heavy duty 6mm thick approximately 7/32 round boot laces shoelaces were designed as replacement laces for the work shoe. proMAX(tm) larger diameter polyester shoe or bootlaces are an Oxford work shoelace. The larger diameter is comfortable across the instep and will remain tied well. They are like two laces in one. The strong inner core fluffs the lace to fill the fashionable outer sleeve for double strength. They are thick but soft laces that will not pinch your instep when laced extremely tight.