SUPERLIGHT All-wool sleeveless T/vest from Australia $48
Good most of the time. Under a cotton shirt, to soak up the sweat and keep it off the cotton. Weighs nothing, quite useful, AND super nice on top of another wool layer. Then if you get too hot, take off this sleeveless job, and suddenly you’re slightly not quite as hot.
Buy your t-size, go UP a size if you don’t want it huggy.James in the photos is 5'9, 160lbs and wearing a medium