FULL HEEL Silicone material is lightweight soft safe non-toxic and harmless to your feet. Preventing and repairing cracking or peeling softening dead skin and improving rough skin for foot. Preventing or curing plantar fascistic metatarsal corns calluses bunions blister. Air holes can provide enough air for your feet to breathe and wick moisture. Protecting toes by reducing friction between them. Can be worn under or over socks with bare feet which is reusable and washable.