Feetures! Ultra Light Cushion/multi-sport - Light Quarter - Black - Medium : Looking for a sock that is super thin and extra breathable? You've found it. With Feetures! unique CoolFeet Ventilation System, Feetures! Light socks help runners and cyclists keep their cool when the action heats up. It's no wonder they are the choice of serious competitors. The Quarter hits just above the ankle to keep debris out of your socks.