Anti-stress cuff in LYCRA Foot arch with anti-twist elastic band for extra grip 2-way elastic mesh with alternating stitches knitting for best perspiration and perfect fit Main structure made with light mesh for comfort Super-flat zero-friction seam double-looped inside and outside Left+Right anatomical structure Longitudinal ventilation channels Light, anatomical multi-contact padding support with ventilation zones under the foot Ventilation zone under the toes Material: 70% Micro-Polyamide 20% Polyamide 10% Elastan (Lycra)