Assertion: roller skate's wheel | /r/HasProperty | retracted into recessed slot
Facets:
value: mostly
type: DEGREE
value: in the heel
type: LOCATION
Source sentences:
text: Heelys, normal-looking street/skate shoes with a single retractable wheel in the heel of each shoe, allowing the wearer to perform unique rollerskating-like moves at leisure while still walking normally when the skating functionality isn't desired (and the wheel is mostly retracted into a recessed slot in the heel).