Smartwool Phd&reg; Cycle Ultra Light Micro Performance Socks, Silver, Medium 26% nylon Style: SW0SW071 - Knit in USA Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management Virtually seamless toe Built for Performance in the Highest Degree, Uses two elastics for greater stretch and recovery to keep the sock in place, Patented ReliaWool technology in high impact areas provides superior durability, Non-cushioned for maximum performance in close-fitting cycling shoes Sock Height: Micro, 1.5&quot; overall height