Trainers became fashionable in the late 1970s you had the cool looking shoe mounted on a bed of what looked a lot like silicone...and then a hard wearing sheet of sole with grip marks on the bottom...you bounced around, you walked on air, I could work 16-hour shifts in a kitchen on concrete floors and my feet were fine...these would always last at least a year...and a lot more........now they look "cooler"...more colours, more styles....most give you "firm" support or other benefits... just don't make your feet feel great.....and the worst crime is that they now all wear out or unusable within 3 months...the soles start showing wear in a couple of weeks...it is ALL about what the market will take...they want you to have 3 or 4 pairs for different reasons, and they want you to buy six or more pairs a year...what to you think?