ThorlosUnisex Experia No Show Experia No Show Multi-Activity Socks - Chestnut Brown, Medium

One of the comments was that they run small. i wear ladies size 9, but my feet are wide.in european sizes i wear a 40. should i buy small or medium?

is size marked anywhere on these socks? i own some but no idea what size. my feet are long, narrow and bony. socks are old and need more!

The size chart here is for clothing not socks/ footwear. What size would be appropriate for a woman’s size 9/10 shoe?