Product Size (US) 4-6 M / 6-8 W 6-10 M / 8-11 W 10-14 M 1 K 1.5 K 2 K 2.5 K 3 K 3.5K 4 K 4.5K 13.5 K 1.5-3M/2.5-4W 2.5-4 Kids 3.5-5M/4.5-6W 4.5-6W / 2.5-4Kids 5.5-7M / 6.5-8W 7.5-9M / 8.5-10W 9.5-11M / 10.5-12W 11.5-14M / 12.5+W 8 (womens 9) 11 (womens 12) 3 (3M/4W) 4 (4M/5W) 5 (5M/6W) 6 (6M/7W) 7 (7M/8W) 8 (8M/9W) 9 (9M/10W) 10 (10M/11W) 11 (11M/12W) 12 (12M/13W) 13 (13M/14W) 14 (14M/15W) 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 11.5-13 Men