Mallorie Estenson, an alpine guide and climber based in the Pacific Northwest, has been using the MSR Advance Pro 2 Ultralight—a single-wall, four-season tent—on some ski-mountaineering trips in Washington this winter. The tent is intended to be simple and compact so that it can fit onto narrow ledges found on the side of a mountain. Estenson reports that it was light, easy to set up, and comfortable enough for her to give it four stars.