I wear variations of the Duluth Fire Hose pants at work every day (construction PM), several fire hose flex, several dry-on-the-fly, one pair of cool-dry fire hose flex. Absolutely the best non-jean pants I've worn in terms of durability, can't recommend them enough.
I've also got a couple variations of Kuhl, Columbia, and 5.11 pants, but they aren't as durable as the Duluths IMO.
Yes, the Fire Hose Flex material is hot in the Texas summers, but the durability makes it well worth it. Plus if it's going to be triple digits, I can wear a pair of the Cool Drys anyway.