Ving Ice helmet is an officially approved helmet by the ISU. According to the rules, the helmet should follow the shape of the head and there should be no protrusions on the helmet.

It's also approved for short track-helmets impact test.

Sizes:

Large/X-Large: 58 - 62cm (22.8" - 24.5") 
Small/Medium: 55 - 58cm (21.6" - 22.8")