X-small Fits Men's 4-5.5 And Women's 5-6.5 Shoe Sizes Active Compression Wear Assisting In The Prevention And Treatment Of Plantar Fasciitis Heel Pain Heel Spurs And Arch Pain Designed With Targeted Compression Zones And Silver Microbial Fibers The Thermoskin Fxt Compression Socks Provide Firm Support And Help Relieve The Heel Pain Associated With Plantar Fasciitis How Thermoskin Fxt Compression Socks Help: - Medical Grade Compression To Unload Stress On The Plantar Fascia. - Arch Support And Elevation. - Compression On The Achilles Tendon. - Moisture Wicking Anti-odor And Anti-bacterial Properties. -all In One Design For Everyday And Active Wear.