-lengkth, -length, -lenth,
/ˈhæfˌlɛŋkθ, -ˌlɛŋθ, -ˌlɛnθ, ˈhɑf-/
something that is only half a full length or height, especially a portrait that shows only the upper half of the body, including the hands.
of half the complete length or height.
(of a portrait) showing only the body from the waist up and including the hands
of half the entire or original length
a half-length portrait
Collins English Dictionary - Complete & Unabridged 10th Edition
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Shanks stiffen the sole and can be full- or half-length and made of steel or plastic.