CUSTOM SUPPORT. BUILT TO RUN. The Nike Spark Lightweight Socks are Breaking2-inspired with a fit that feels almost like going "" barefoot "". Supportive where it counts, they feature a ventilated pattern to help keep you comfortable with every step. Customized Fit Snug comfort from the toe to the top of the sock helps create an almost "" barefoot "" feel. A triangular underfoot arch pattern supports your medial and lateral sides, and lets you wear your socks on either foot. Breathable Materials Ventilated mesh at the top of the foot helps keep you cool. No-Slip Design Spandex in the heel keeps the sock stable as you move. The secure design helps ensure the sock won't slip down on your run. Sweat-wicking technology helps you stay dry, comfortable and focused. More Details Reflective Swoosh design trademark 85-87% nylon / 13-15% spandex Material percentages may vary depending on color. Check label for actual content. Machine wash Imported Not intended for use as Personal P