Fit on both pants are similar to one another. They fit me slimmer in the waist/thigh than the sitka timberline/mountain pant/kuiu attack. I always found those pants to be cut strangely baggy in the butt/thigh/knee, and would bunch and pinch under my pack belt. I'm 5-10, 178 lbs, size large tops, size 31-32 waist and 33" inseam in most jeans ect. I lift very regularly and have muscular thighs but not crazy thick. I'd guess the heavier guys or guys with huge body builder thighs would find both these pants on the snug side in the butt/thigh area.
The gamma AR would be very similar to the sitka mountain pant/kuiu attack in fabric thickness, but it does better in colder weather. I'd say it's comparable to the timberline in warmth because of the way it cuts wind. It also breathes far better than any of the above pants. I've been using them for late season mule deer in MT the last couple weeks either against the skin or layered with icebreaker 200g Merino and been comfortable to temps down to below zero (esp while moving, glassing sessions beyond an hour in those temps start to get pretty cold). I prefer these pants in the 0-45 degree range
The mammut courmayeur would be somewhere between the sitka ascent and sitka apex in fabric thickness. Feels different than either though, more of a classic soft shell. They are surprisingly quiet however. I have used them for early season mule deer hunting for two seasons and had zero issues with noise closing the distance in bow range. These are my favorite backcountry pants I've ever owned. They breathe really really well, but somehow still cut the wind and cold pretty good. These are my go to for anything in the 45-80 degree type range. I use them for summer backpacking/high lakes fishing where the temp range is extreme from hiking lower trails in the 90s or warmer to freezing at nights up above timberline. I won't say these are perfect for those hotter temps, but they breathe/move moisture so well yoy can get away with them. Days that start cooler (around freezing) but warm up to the 50s or 60s, these are perfect.
Side note, I tend to run on the warm side and sweat a lot. I hunt in southwest MT/WY high mountain type terrain, so there's a lot of hard hiking involved. It's always been my struggle to find pants that won't get swampy on hard hikes into glassing peaks/knobs, but then can handle the glassing sessions after without freezing out.
Hope this helps
Sent from my Pixel 3 using Tapatalk
