I walk, I walk a LOT at work and after an 8 hour shift my feet still feel great. After a 12 hour day they are tired but what wouldnt be? Absolutely NO BREAK-IN Time, comfortable right out of the box. Had them about a year now and they've still got a ton of life left in them. Light weight, sturdy, breathable, cleanable, just worth every penny. Go AMAZON & ASICS ! ! !