This is the size guide for Peerko. As always, the measurements are from the inside of the shoe.

Remember to leave a space of 0.8 to 1.2 cm in length and a minimum space of 0.3 mm in width.

Size	Inner length	Inner width	Shaft circumference
37	24.2	9.6	36
38	24.8	9.7	37
39	25.5	9.8	38
40	26.2	10	39
41	26.8	10.3	40
42	27.5	10.6	41
43	28.1	11.1	42
44	28.8	11.3	43
45	29.4	11.6	44