Smartwool Men's PhD Outdoor Ultra Light Micro Socks (Navy) Medium Virtually seamless toe Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management Sock Height: Micro, 1.5" overall height Style: SW0SW035 - Knit in USA of Imported Yarn 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, Minimal cushioning for maximum performance in close-fitting shoes.