SubjectsFascinating FactsHuman Body FactsFactsIP Factoids The thickest skin in your body can be found on your feet. By IP Factly - Nov 17, 2015 0 4 Share on Facebook Tweet on Twitter Image credit: Stilfehler/GFDL. Most of your skin is 2 to 3 mm thick but the skin on your feet can be up to 4 mm thick, especially on your heels. This thickness prevents the veins and bones in your feet from getting damaged even when you walk more than 5,000 steps per day.