A crack that is too wide in which to use a hand-jam but not as wide as a chimney. Requires a specialist technique to climb and tend not to be very popular because of this. The ascent of some off-widths are said to require enough energy to light a small town
A crack, dreaded by most rational climbers, that is too wide for a hand or fist jam and too narrow to "chimney." Generally awkward and strenuous to climb, and difficult to protect.