Every time we see these go out we know someone lovely is going to match them well. Bamboo socks are certified organic by OCIA and certified free of harmful chemicals by OEK-TEX. Feel good about getting this pair. Size 9 - 11 (Women&';s Shoe Size 5-10.5) Note that these are more on the fashion sock side of things - lightly cushioned, not recommended as "active wear" socks.