Drymax Unisex Max Cushion Run No Show Tab Socks Elastane Thin mesh top keep feet cool and dry, and the vented arch band holds sock in place Y-Heel improves fit, and the anti-slip wedge helps prevent sock from slipping down into the shoe Dual layers knit toether keeps feet dry Flat toe seam Color-Replacementd size mark on toe for easy match-up after laundering