I wear a lot of woolen tops for backcountry trail running and this one is great for runs of any intensity or distance, but without a backpack. For me at least, looser fitting styles like this one can ride up my back if I have a backpack on-- but without a backpack on this is hands down a new favourite. Loose but still tailored, delivers on the anti-stink, and comfortable seams. I like the longer length too.