I tried these sleeves on a whim, and now I cannot imagine how I got by without them! I use them for hiking, scrambling and climbing trips: I love wearing tank tops, but sunscreen makes me sweat and I never seem to apply enough of it everywhere. The sleeves are comfortable and they stay up; I love the option to cover my hands when using an ice ax, or quickly take my hands out of the fingerless glove part. They also stay remarkably cool (the active ice, I guess!). They are probably my new favorite piece of gear!