I'm surprised so many people are recommending Corrugate Foundry pants when the OP is looking for something warmer than Sitka Timberlines. Don't get me wrong, I really like the Corrugate Foundary pants, but the Timberlines are much warmer. The Catalyst Foundary is going to be similar to the Timberlines. I've used both and while there's things I like better about the Timberlines, I ended up sticking with the Catalysts mostly due to the side zippers.
I personally wouldn't want anything warmer than either of those for active hunting. When temps get cold enough I have some puffy pants to go over them and stay super comfortable when stationary. I've also used my rain pants as a wind blocking layer a few times with great success as well.
I have a pair of Kryptek Njord pants that are essentially fleece lined and really warm, but I don't like hiking in them at all.
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