Measuring roughly 2.75 metres east to west and just 2 metres north to south, it is barely large enough to shelter a person lying down, let alone a family. Yet that was more or less the point. This is a booley hut, a temporary structure used during the practice of booleying, the Irish tradition of moving livestock to upland summer pastures and living among them for the grazing season. The people who built and used these huts were not settling the mountain; they were following the grass.

The hut is defined by a drystone wall, a technique requiring no mortar, just carefully chosen and stacked stone, built here to a surviving height of around 0.81 metres and a width of 0.5 metres. It has held together reasonably well over time, though the western side has collapsed. What is particularly striking about its location at Grousemount is that it does not stand alone. Three other hut sites sit in the immediate area, suggesting this was a small cluster of seasonal shelters rather than a single isolated outpost. Communities would move together to the high ground, and the grouping of these structures reflects that collective rhythm of pastoral life, repeated across generations until the practice faded from use.