It is not especially large, just over four metres in diameter and standing about a metre high, with walls just over a metre thick. What makes it worth pausing over is its construction: corbelled drystone, a technique in which stone courses are laid so that each projects slightly inward over the one below, gradually closing the roof without mortar or timber. The result is a self-supporting stone dome, a form of building that appears repeatedly across the Corca Dhuibhne peninsula and connects this valley to a much older tradition of occupation in the west of Ireland.

The hut was recorded and measured by R. A. S. Macalister in 1899, and his figures, a diameter of 4.19 metres, are still the ones attached to it. The structure shows evidence of considerable rebuilding at some point in its history, which complicates any straightforward dating but also suggests it was considered worth maintaining, perhaps across several generations of use. Whether it served as a seasonal shelter for those working livestock on the mountain, a hermit's cell, or something else entirely is not recorded. The valley it sits in, Gleann Fán, belongs to the broader Dingle Peninsula, a landscape that has yielded an unusually dense concentration of early medieval and prehistoric remains, many of them still sitting quietly in the hills without signage or fencing.