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. Customised FitSnug 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 MaterialsVentilated mesh at the top of the foot helps keep you cool. No-Slip DesignElastane in the heel keeps the sock stable as you move. The secure design helps ensure the sock won't slip down on your run. Features Sweat-wicking technology helps you stay dry, comfortable and focused. Reflective Swoosh design trademark. 85–87% nylon/13–15% elastane.