For a barefoot feel with subtle micro cushioning, the Nike Spark Lightweight Crew Socks in Black/Reflect Silver keep you light on your feet throughout your run. The Nike Spark Lightweight Crew Socks have switch foot arch support to hold your foot and ensure that the underfoot cushioning is placed correctly. Mesh fabric at the top of the foot aids ventilation. Switchfoot arch support lets you wear your socks on either side, allowing you to curate where your underfoot cushioning is placed. Fabric in the heel helps secure the fit for support. Mesh at the top of the foot helps provide ventilation. 82% nylon, 18% spandex. Machine wash. Not intended for use as Personal Protective Equipment (PPE).