Now Feetures! has a running mate: Feetures! Light. A sock specifically designed for athletes (especially runners) preferring a thinner sock and who are concerned about heat build-up. With its unique CoolFeet Ventilation System™, Feetures! Light helps you “Keep Your Cool.” Content : 41% CoolMax® Polyester,32% Acrylic, 21% Nylon,6% Lycra® Spandex |