Experience a barefoot feel with subtle micro cushioning in the Nike Spark Lightweight Crew Socks. Designed for runners, these socks offer arch support to ensure correct placement of underfoot cushioning and ventilation through mesh fabric at the top of the foot. The unique Switchfoot arch support allows you to wear the socks on either side, personalizing where your cushioning is located. Fabric in the heel provides a secure fit for added support. Made from 82% nylon and 18% spandex, these socks are machine washable. Not intended for use as Personal Protective Equipment (PPE). Sweat-wicking technology and an arch band contouring the foot ensure a secure fit and feel. Mesh at the top of the foot keeps you light and comfortable mile after mile.