I have them. I'm pretty sure it's the same fabric as the mountain/timberline pants. So on the heavier side of you're hoofing it in warm weather. The seat is waterproof. So far I've warn them in temps from 60-80 and they've been awesome. Definitely a little warm if you are hiking around in 75* temps, but not too bad. Very durable. Quiet enough for me. Slight swish nose if you are running the fabric but it's really not bad, and seems to soften over time. The cut of them is generous but narrow enough to slide into a pair of bibs with which I love.