These slippers are more beautiful than thick socks. they see in all colors great.

The manual describes the variables:

German: 36/37, 38/39, 40/41, 42/43
USA: 6/7, 7 ½/9, 9/10, 10 ½/11 ½

Crochet skills are required. But the manual is described and illustrated lap after lap and row by row. So that everyone is clear.