SKIN-LIKE FEELING - Next generation sox from Pro Mountain : Seamless toe gives you super comfort. YES FOR HOT WEATHER - Maximum climate control with 1 layer 30s Combed Cotton and mesh structure. LOW ENOUGH FOR MOST - invisible for most casual or athletic shoes. Not for extreme low loafers. NATURAL YARN FOR YOUR SKIN - If synthetic socks were not for you this cotton socks is just for you. SIZE EXPLAINED - 9 = Women Shoes 5.5~7.5, 10 = Women Shoe 7.5~9.5, 11 = Women Shoe Size 9.5~11.5 Material Composition: 73% Combed Cotton / 20% SPANDEX / 5% Polyurethane / 2% Polyester, Made in South Korea Care Instructions: Machine Wash 45 years of craftsmanship - Pro Mountain Socks. The seamless no show socks came out with founder's last investment on socks. Truly seamless, comfortable just like your second skin.