Section 2: Equipment

Clap skate mechanism: Permitted since 1998. The blade is hinged at the toe, allowing the heel to lift during the push-off phase while the blade remains on the ice longer. This increases stride efficiency by an estimated 5–7%.; Blade length: 33–50 cm (13–19.7 in), depending on foot size and distan...

Source: Rule 291

Send this to your friend — argument over.