I bought these shoes about 10 months ago, got injured and had to stay of them for awhile. I wore them to the gym, a lot of low impact stuff. anyway, the plastic coating frayed on the left shoe (nearly a year later) and now the boa system does not function. luckily it was at just the right spot that i can slip the shoe on and off and it's tight enough to run in. other than this, this is the most comfortable shoe i've ever worn. take care of the boa and you cannot beat this shoe.