Cuff-down heel flap socks, in 2 sizes:
M (EU37-39, UK4-6, US5.5-7)
and L (EU40-42, UK6.5-8, US7.5-9.5)

This pattern has been re-edited, and mistakes fixed.

The yarn I firstly used was AquiLana - 3ply 330m per 100g - (last pictures). And Koigu KPPPM - 2ply 160m per 50g.

The current yarn is a classic wool sock yarn (100g per 400m).