Sockliner vs. insole: what’s the deal? Let Dan from fleetfeetburbank break it down. Every running shoe has a sockliner – the layer of soft foam your foot rests on. It gets the job done, but it’s designed to be removable so that you can replace it with an insole for a more customized fit. Here are four reasons to go with a more supportive insole, like currex, for your running shoe. #FleetFeet #Currex #Insoles #RunningShoes #FootPain