The perfect summer layer. I've worn it doing every type of summer activity, and after my Arcteryx Atom LT, this is probably my most worn/loved piece of gear.
Whether you're hiking, climbing, or getting on the river, this sun layer is a must-have. It's kept me out of the sun on a plethora of adventures, all without keeping me too hot. The Alpenglow has a rating 50+ UPF, meaning you won't get as tired due to the sun (or get sunburned). It dries quickly, and depending on conditions I've worn it by itself, as mid-layer, or as a hoodie with t-shirt underneath.