Cavallo Simple Boot size 0 converted to Scoot Boot Classic (Regular)

Sizing across brands only works through the millimetre band, never the number. Cavallo Simple Boot and Scoot Boot Classic (Regular) both publish in millimetres, so a Cavallo Simple Boot 0 (hoof length 102 to 109 mm) is matched by finding the Scoot Boot Classic (Regular) size that covers the same length.

The Simple is a square boot, width equal to length. If your hoof is clearly longer than wide, the Sport (narrower) or the Trek Slim sole fits better than the Simple.

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.