You asked for it – you got it: the muscle-toning shoe you can wear while running, training & working out. Compared to a traditional running shoe, Run Tone encourages more activation in key leg muscles like the calves & quads & reduces overall body stress. The Run Tone patented sole technology features 8 pods of moving air that force your muscles to work harder; encourages increased muscle activation, toning, strength & endurance. The Smooth Fit seamless liner minimises rub & irritation.