“For small children, comfort is more important than high performance. Boots are the most important piece of gear, and a proper fit is essential to the whole experience. Too tight and they’ll get cold feet, too loose and they won’t be able to control their skis. These aren’t Olympic racers, so no need to squeeze ’em into tight form-fitting boots.
All ski boots (kids and adults) are now using ‘Mondo sizing’. This is a universal sizing based on centimeters. The plastic outer shells are usually only in whole sizes, while the inner liners are in half sizes.”