ROTOTO SOCKS PILE FOOT COVER Size: 27-29cm Color: Light Gray This foot cover features a pile knit on the sole and is knitted in a three-dimensional structure. By using a special knitting machine and special stretch yarn not typically used in general socks, it provides a snug, clinging fit. The yarn is a blend of "dralon," a high-absorbency acrylic fiber made in Germany, and cotton. The yarn itself is treated with "Ronfresh," a natural organic deodorant finish, offering anti-odor benefits.