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O'Neill Boot Size / US UnisexUS Kids' Shoe SizeEUUK
XS8-9K26-277-8
S10-11K28-299-10
M12-13K30-3111-12
L1-232-330-1
XL3-4352-3
5 364
6 37/385
7 396
8 407
9 41/428
10 439
11 4410
12 4511
13 4612
14 47/4813