HEEL PROTECTORS M-F JUNIOR BLUE STAR, 12/BX MFG: M-F ATHELETIC MF Heel Protectors MF protectors use body heat to conform to heel areas of any size or shape. Protect heel injuries and skin fissures and relieve discomfort in the Achilles tendon, shins, lower back and ankles. The unbreakable, lightweight plastic is completely ventilated.