As a long time asics user I am super disappointed and feeling ripped off. Upper heel on the inside wore through the fabric on both shoes prematurely. Soles are a super soft rubber that too wears ridiculously fast.  I have a pair of ds trainers that I bought at the same time and have held up WAY better than the kayanos.  At least I can still use those.<br /><br />If you have issues or even hesitation to question asics do it asap so that they will actually warranty the shoes.<br /><br />Here's what asics says, note there is not a way to claim how long they wear:<br /><br />Product must not be altered, abused, or excessively worn.  Please note that running shoes are typically expected to last 300-500 miles.  Returned shoes that appear to exceed these amounts may be considered to have normal wear-and-tear and excessively worn