J.B. Field's® Men's & Women's 40 Below True North Wool Thermal Crew Socks are similar to their plain 40 Below Arctic Trail socks but with a pattern.There is a 'Maple Leaf' motif on the leg of the Large and a Snowflake Pattern on the Medium. If you are looking for one of the warmest socks available, look no further—these contain 85% Wool! J.B. Field's® recommends wearing a liner sock for additional moisture-wicking and comfort. Preshrunk Wool, Nylon and Acrylic knit Full cushion Reinforced heel and toe Arch and ankle support Machine wash warm, wash inside out, do not bleach, tumble dry low Made proudly in Toronto, Canada Size Chart: Medium fits Men's 4-8 Shoe / Women's 5-9 Shoe Large fits Men's 8-12 Shoe / Women's 10-13 Shoe Product Features: Fabric:85% Preshrunk Wool, 13% Nylon, 2% Acrylic J.B. Field's Men's & Women's 40 Below True North Wool Thermal Crew Sock