Scoot Boot Classic (Regular) size 9 converted to Cavallo Trek

Sizing across brands only works through the millimetre band, never the number. Scoot Boot Classic (Regular) and Cavallo Trek both publish in millimetres, so a Scoot Boot Classic (Regular) 9 (hoof length 150 to 155 mm) is matched by finding the Cavallo Trek size that covers the same length.

Scoot's own rule: if the hoof is 10 mm or more wider than it is long, size on the maximum width band, not the length. A round hoof can also take a Slim as a half size.

Cavallo sizes on length, then you pick sole width. If your width is 6 mm or more under your length, choose the Slim sole in that size; otherwise the Regular sole.