Cavallo Sport Boot size 4 converted to Scoot Boot Classic (Regular)

Sizing across brands only works through the millimetre band, never the number. Cavallo Sport Boot and Scoot Boot Classic (Regular) both publish in millimetres, so a Cavallo Sport Boot 4 (hoof length 134 to 141 mm) is matched by finding the Scoot Boot Classic (Regular) size that covers the same length.

The Sport is the narrow cut, roughly 6 mm under the Simple in width. A round hoof whose width equals its length will pinch in a Sport and wants the Simple instead.

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.