It measures eighteen metres across and is defined by a low bank of earth and stone, roughly three metres wide and less than a metre tall. There is no trace of an entrance, no fosse (the ditch that typically accompanies a defensive enclosure), and no identifiable internal features. It is classified, tentatively, as a tree-ring.

A tree-ring is a type of designed landscape feature, essentially a circular bank constructed to enclose and protect a formally planted tree or group of trees, often within a demesne or estate setting. They are associated with deliberate aesthetic landscaping rather than with prehistoric or defensive purposes, which makes them a relatively modest but telling sign of how landowners once shaped their surroundings for ornament as much as utility. The Giltspur example carries the qualifier "possibly" because, without an entrance or other distinguishing details, the feature cannot be firmly assigned to this category. Archaeological monitoring carried out in 2004, immediately to the east of the enclosure during topsoil removal works, produced nothing of archaeological significance, leaving the structure's origins no clearer than before.