The first-ever Plantar Fasciitis sock featuring award winning, patented FS6® technology. A technical performance sock that strengthens the foot structure and prevents Plantar Fasciitis symptom onset as well as overuse injuries. With precise targeted compression levels and cushioning, the FS4 Plantar Fasciitis sock features Compression Zone Technology® that is designed for proper foot support. Merino Wool or Ultra-Soft Nylon Merino Wool - 100% recycled material, moisture-wicking, added warmth, durable, soft Ultra Soft Nylon -High quality, durable, moisture-wicking treatment with anti-odor treatment Targeted Conditions Plantar Fasciitis Foot Fatigue Arch/Heel Pain Performance Features Medical Grade Support Y-Gore heel for anatomical shape Patented Compression Zone Technology® Seamless Construction Extra cushioning without the bulk Anatomical left/right design for perfect fit Anti-bacterial fabric Comes with one (1) pair of socks per package.