Our merino wool socks are very stretchy and soft! 

Insole length Sock size
10 cm 3,9 in 13/15
12 cm 4,7 in 16/19
14 cm 5,5 in 20/23
16.5 cm 6,5 in 24/27
18.5 cm 7,3 in 28/31
20.5 cm 8,1 in 32/35
22 cm 8,7 in 36/39
26 cm 10,2 in 40/43
28 cm 11 in 44/46