clap skate
/ˈklap skeɪt/(also klap skate)
noun
In speed-skating: a type of ice skate designed for increased speed, consisting of a boot which lifts from the blade at the heel (affording the blade a longer time in contact with the ice) before snapping back into place.
Origin
1990s; earliest use found in The Montreal Gazette. From clap + skate, after Dutch klapschaats (from Dutch klap + schaats) with reference to the noise made by the skate when the blade snaps back into place.