Premium wool mixed with targeted mesh areas gives you warmth for cold winter runs and help to stop your feet from overheating as the run warms up, in the Nike Spark Wool NoShow Running Socks in Smoke GreyDk Smoke GreyReflect Silver. The Nike Spark Wool NoShow Running Socks provides a close, supportive fit thanks to the dynamic arch band, and a natural irritation free fit is attained thanks to the smooth toe seam and anatomical leftright fit.Premium wool keeps your feet warm, and wicks sweat naturally, while smooth fabric mesh zones aide air flow. 52 wool24 nylon20 polyester4 spandex Machine wash Reflective elements Not intended for use as Personal Protective Equipment PPE. Smoke grey / dk smoke grey / reflect silver