Shoelaces have long been a problem with just about every shoe I buy—premature failure.
See also Gear for the Mountains.
This is ridiculous—I’ve hardly worn these FiveTen Guide Tennie approach shoes. The laces ruptured into nearly useless junk. Now that Adidas bought FiveTen, the quality may go downhill further as costs are surely cut, and FiveTen was quite good at least in terms of the shoe itself.
One reader suggested parachute cord, which I tried, but it turned out to be useless—even worse—suffering the same sheath/core disintegration as the original laces, and there is no easy way to make stiff ends to feed through the holes.
A much better solution is to buy shoelaces for hiking shoes (63 inch length for these shoes)—which I did and will report on the quality when I try them.
Update: the DELELE 2 Pair Round Wave Shape Non Slip Heavy Duty and Durable Outdoor Climbing Shoelaces fit great and are a close match for the original laces, but look to be better made.