For this past summer’s guiding season, I wanted a jacket light enough that I could carry it along, even if there was the possibility I might not need it. I found that this was a common situation in the Tetons–I would start summit days in shorts, convinced that the conditions would prove comfortable, but inevitably the winds would swirl and the temperatures would plummet to below freezing. So while guiding in the Tetons this summer, the lightly insulated Generator Jacket from Rab proved itself to be a brilliantly designed, key lightweight layer.