Calf Size Charts (All measurements below are shown in millimetres)
Calf Width / BootsStandardCurvy*Super CurvyCurvy PlusExtra Curvy Plus
4E400434468502536
5E408442476510544
6E416450484518552
7E424458492526560
8E432466500534568
9E440474508542576
10E448482516550584
 
4EEE408446480514548
5EEE416454488522556
6EEE424462496530564
7EEE432470504538572
8EEE440478512546580
9EEE448486520554588
10EEE456494528562596
 
4EEEEE418458492526560
5EEEEE426466500534568
6EEEEE434474508542576
7EEEEE442482516550584
8EEEEE450490524558592
9EEEEE458498532566600
10EEEEE466506540574608

*Previously named Extra Ultra Large

Foot Width Size Chart
Foot WidthStandard DEEEEEEEEEEEEEEEEEEEEE
3210216222228234241247
4216222228234241247254
5222228234241247254260
6228234241247254260266
7234241247254260266272
8241247254260266272278
9247254260266272278284
10254260266272278 284 290