Craft Size Chart The Glow Sock is a thin bike sock featuring reflective yarn that makes you visible from all angles. The high-visibility yarn threads are knit into the shaft, ensuring lasting reflectivity. In addition, functional fabric and mesh at the top keeps your feet cool while arch ribs ensure that the sock stays in place on your foot. Features: - Quick-drying fabric - Mesh top panels for cooling - Arch ribs keep sock from slipping - Reflective yarn - 98% Polyamide, 2% Elastane