I purchased a business with a 5,000 sqft warehouse after working in a cubicle for 15 years. After the first week of walking the warehouse my feet were bloody stumps, and then I bought these air max’s and holy moly I stand on the concrete for 8 hours a day with no foot, ankle or knee pain. I am shocked at how comfortable they are. After about 7 months of daily use I am seeing the soles becoming worn down but I do walk and carry heavy loads for 8 hours a day.