Power bands of Lycra hug your entire foot for maximum support. This snug, supportive fit eliminates movement to prevent blisters. High density cushioning provides extra protection in high impact areas. iWick fibers wick moisture to keep feet cool and dry. Mesh construction on top of the sock provides ventilation for added breathe-ability. Y-heel construction keeps the sock from sliding into the shoe. The Perfect ToeTM (No irritating toe seam). No Show Tab height which sits below the ankle for maximum versatility FEETURES! SOCKS SIZE CHART.   Both mens and womens sizing..see below! SMALL    FITS:  (WOMENS 4-6.5) MEDIUM FITS:  (MENS 6-8.5)  (WOMENS 7-9.5) LARGE    FITS:  (MENS 9-12)   (WOMENS 10-13) X-LARGE FITS:  (MENS 12.5-15.5)