The Sport Lightweight Hidden is the perfect sock for everyday use without the look of wearing socks. Available only in the charcoal color, the Hidden features a silicone grip in the inside heel to prevent the sock from slipping. The lightweight ultra-thin construction wicks away moisture and prevents blisters in any shoe. Sizing? No problem. This Injinji sock is unisex perfect for both female and male runners. Please refer to the sizing to find the correct pair of Injinji socks for you!