PUMA Motorcyle Boots size chart from Sportbiketrackgear.com

European	English	U.S.
38	5	6
38.7	5.5	6.5
39.3	6	7
40	6.5	7.5
40.5	7	8
41	7.5	8.5
42	8	9
42.5	8.5	9.5
43	9	10
44	9.5	10.5
44.5	10	11
45	10.5	11.5
46	11	12
46.5	11.5	12.5
47	12	13
48	12.5	13.5