Health King Massage Accupressure Foot Slipper Large Size fits Men (9-11)/ Wom. VELCRO ADJUSTABLE WIDTH,Slipper Foot Massager for Tired Feet Strong Antibiotic Function:Nano-sliver is intermixed with the plastic to aid with antibacterial and deodorization functions Healing Function:Fifteen-minute use per day helps relieve aches and pains as well as aiding in maintaining overall health Acupressure Function:Each nodes have different pressures on the springs to give more push where you need it most Magnetic Function:Magnets have been strategically placed to provide magnetic therapy, which aids in healthy blood circulation