I've been wearing Saucony running shoes for a number of years, switching from Triumph to Triumph. My last pair was the ISO 4 and 5 - both were very solid shoes - great support and durability. Unfortunately, this pair of ISO5 is not enough - after only 4 weeks of wearing (running about 50 km) - one side wears out and tears. Very disappointed. and unfortunately received a cold reception from the support team.