extremely disappointed. I have a pair of Excalibur Running Nike Air running shoes and I love them, they work great. Do you have achilles tendon problems and they work best. Wanted a backup and it looked great. I wore the shoes twice for one run and the air bladder burst on the second run. I also have flat feet so the walk back was tough. Very disappointed with this shoe, was very happy to be able to walk again but has now retired.