Foot arch with anti-twist elastic band for extra grip with graduated stretchable mesh 2-way elastic mesh with alternating stitches knitting for best perspiration and perfect fit Main structure made with light mesh for comfort, sensitivity and breathability Left+Right anatomical structure Very comfortably shaped toe with anti-friction seam looped outside Ventilation zone under the toes Material: 60% Micro-Polyamide 25% Polyamide 15% Elastan (Creora)