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". The lightweight mesh encircles the entire foot in two places for better ventilation and breathability. The CoolMax helps keep feet dry. The unique Power Bands of Lycra hug your foot for maximum support. It has a "Y" heel design for the best fit. The size is indicated on each sock for easier identification/matching. The light fibers protect, but without the bulk. Famous Fit & Feel - it won't slip inside your shoe. It has the has the PerfectToe, no irritating toe seam. They are made of 41% CoolMax Polyester, 32% Acrylic, 21% Nylon, and 6% Lycra Spandex.Available Colors: Black, White.