Thermoskin Plantar FXT Compression Calf Socks provide moderate graduated compression from the ankle to calf to promote blood circulation. Firm upward compression zone targeted at the plantar fascia attachment to unload stress. Firm compression zone targeted at the Achilles tendon for support and comfort. Moderate to firm compression band around foot arch for additional support. Comfort foot pad at ball of foot for extra cushion. Moisture wicking, antibacterial silver microbial fibers in toes and heel for comfort.