4F FNK M261 Boy's Socks Deep Black 4FJWMM00UFSOM261 20S Boy's training socks with 4FDry technology wick away moisture and provide comfort during activity. The flexible material adapts well to the foot, while reinforcements and a flat seam increase durability and comfort. The set includes 3 pairs up to the ankle. Technical data: Material: 97% polyamide, 3% elastane Height: up to the ankle Elastic cuff Elastic cuff on the midfoot Elastic cuff around the arch Ventilation zone Achilles tendon protection Flat toe seam