These are lightweight and breathable, as advertised. I bought a couple pair while they were on sale to test their performance. I've had them for a few weeks now and have worn them during workouts and hikes. I've been impressed so far…they wick sweat well, dry quickly (IF you have breathable pants or shorts over them), they're comfortable, the longer legs keep them from riding up as you move. I think they're going to perform well in the backcountry.