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 : 44% CoolMax® Polyester,37% Acrylic, 15% Nylon,4% Lycra® Spandex |