Buy Purederm Foot Creams - Purederm Botanical Choice Intensive Repair Foot Mask - Avocado 1 Pair. How-to-Use: Wash your feet with warm water. Open the pocket and wear the foot masks. Wear vinyl socks over foot masks. Fix vinyl socks to the ankle with enclosed bands. After 20-30 minutes, put of the vinyl socks and foot masks. You don"t need to wash feet again.