Propet Ped Rx Mens Ped Walker 3 Slip-Ons let your toes spread out with a generous fit This casual slip-on is designed to maximize your comfort with the Twin Removable Insole System-the Rex Insole supports your arch and cushions your steps with memory foam while the second insole absorbs shock. The supple leather upper features a padded collar and a neoprene vamp that stretches around your foot for a perfect fit.