I'd compare the Timberlines more to the Catalyst Foundry than the Corrugate Foundry. They are more of a mid to late season pant. While I like both of them and probably slightly prefer the fit of the Timberlines, the side zipper on the Catalyst won out for me and I sold my Timberlines. Neither of those pants comes out for me unless it's colder temps.
I really like the Corrugate Foundry a lot for early to mid season. The hip vents are large and really dump heat well, which is great on a pant with knee pads. They don't have mesh in the vents so they really dump heat well but can let in debris if you are hiking through brush. The hip vents zippers are legit one handed operation, they work well. The knee pads are comfortable and removable if needed. These pants get a lot of use from me. They are a bit loud for archery, but anything rifle hunting they are my most used hunting pants.
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