I've bought at least five pairs of Triumph shoes so I obviously like them. But when I checked different models, they had different durability issues. At ISO 3, the plastic broke in the heel. All pairs prior to this ISO 5 had the heel lining fraying and the cushioning dissolving/cracking - basically a good sign after about six months that it was time to replace the shoe. This time, after four months, the upper part of the shoe above the big toe wore out and finally broke. I run every day so I really expect the shoe to wear out - I just wish it lasted 6 months rather than 4.