First of all, I think this is a great shoe in many respects, but I cannot abide how quickly the cushion wore out. I have had other pairs of Montrail shoes that I have loved. This shoe is incredibly light, it's cool and has great traction. However, the soles of my shoes are still nearly pristine, but the medial heel cushion has completely collapsed on both shoes. It caused my to start having lateral knee pain, which totally went away when I got back into the other brand I trust. I usually retire old running shoes to lawn-mowing and other around-the-house tasks, but these are so lopsided now that I worry every time I put them on that I'm damaging my gait, so into the trash they shall go. Just to put down any gait experts, I am not an over-pronator, I usually wear out shoes very evenly in a normal and healthy pattern, and I am light enough that I'll wear down a sole before the cushion collapses. This shoe just didn't cut the muster.