Scoot Boot Slim size 3 Slim converted to Flex Boot (Regular)

Sizing across brands only works through the millimetre band, never the number. Scoot Boot Slim and Flex Boot (Regular) both publish in millimetres, so a Scoot Boot Slim 3 Slim (hoof length 120 to 125 mm) is matched by finding the Flex Boot (Regular) size that covers the same length.

A Slim is for a hoof that measures narrower than it is long. If your width is at or above the length band, you want a Regular, not a Slim, in the same number.

Flex fits within plus or minus 5 mm of the listed width and no longer than the listed length. A naturally round or upright hoof wants the Flex Wide, whose length and width match, rather than the Regular.