It is a booley hut, one of five clustered in the same area, and its near-invisibility is rather the point. A booley hut was a seasonal shelter used during the practice of booleying, the Irish tradition of moving cattle to upland summer pastures, known in Irish as buaile. The herders, often younger members of a farming household, would follow the animals and live rough on the mountain for the warmer months before descending again in autumn. These structures were never meant to last; they were built quickly, used hard, and then left to the weather.

This particular hut measures roughly eight metres north to south and six metres east to west, its perimeter defined by a dry stone wall that now stands only about thirty-five centimetres high, its upper surface long since colonised by grass and heather sod. What makes it a little more considered than a simple ring of stones is the way it handles the hillside. Cut into a slope running from northwest to northeast, the builders added a retaining wall on the uphill side, reaching about forty centimetres on the interior face, to level off the ground and compensate for the incline. The interior itself faces west, a practical choice that would have caught the afternoon light and offered some shelter from the prevailing winds. It is a small but telling detail, evidence that whoever built and used this place was solving real problems in a real landscape rather than simply stacking stones at random. The four neighbouring hut sites in the same cluster suggest this part of Grousemount was a well-established stopping point in the seasonal round, used perhaps by the same community across generations.