Pear Izumi Flash Reflective SockIf you are riding in the early morning or evening hours then its necessary to have reflective clothing. The Pearl Izumi Flash Reflective Socks are performance riding socks that feature BioViz reflective stripes at the cuff, so you stay seen in low light conditions. The Flash Reflective Socks are made with Pearl's Elite Transfer fabric which wicks moisture from your feet and keeps you comfortable all ride long. Flat toe seams further enhance your comfort reduce irritation. Features Moisture-wicking Elite Transfer fabric BioVizA(R) reflective stripes at the cuffFlat toe seams SizingSizeSmallMediumLargeExtra LargeMen's Shoe Size (in)-6-88-1010+Woman's Shoe Size (in)5-77-99+- | Pearl Izumi | Flash Reflective Sock Men's | Size Small in Black/Screaming Yellow