I have 2 pairs of Cabela's Dry-Plus pants that I really like. One is insulated, the other isn't. I'd give model numbers but they're both discontinued. Even in temps down to maybe -15F I find the uninsulated ones more comfortable with just a lightweight base layer. I use them for snowshoeing and I'm pretty warm-blooded. These
are pretty close to my insulated ones, though I think mine may have more insulation (Thinsulate Ultra.) Mine also have full-length side zips, built-in gaiters, but no suspenders. I use a pair of heavy duty Carhartt suspenders with them.