It's just one night, but I was able to test out the Grumman jacket...
I went up into the mountains and did some scouting yesterday afternoon, and spent the night in the woods. Below is a photo of the only clothing that went with me on the overnight trip.
.Can't remember the brand Lightweight Merino Socks from New Zealand (logos worn off)
.Firstlite Wick Bottoms (Full length version that they don't make anymore)
.Fjallraven Vidda Pro Venitilated Pants
.Outdoor Research Tradecraft Puffy Pants
.Firstlite Wick Hoody
.Patagonia R1 Air Hoody
.Stone Glacier Grumman
.Sherpa Lined Brimmed Beanie Hat
.Fingerless Merino Gloves
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I sat static and glassed all evening until dark. Got off the ridgeline and down into the woods cover to sit static while the temps dropped. While glassing up high, I was warm enough to not need the Grumman or Tradecraft pants much... I did throw the Grumman on at one point unzipped when the wind picked up as it was getting too dark to glass. It immediately came off for the quick hike down to where I slept.
While at "camp" I didn't make a fire on purpose so I could check the warmth of the coat. By the time it hit 10PM it was already down to the mid 40's and I was ready for the Grumman. I stayed up in it for another two hours perfectly warm and went to sleep.
Up at 4:00 the next morning and it was mid 30's. Sucked to get out of the bag and get the pack on but I hiked up to the glassing spot and was there well before first light.
I pretty much instantly needed the Grumman and Tradecraft pants while sitting static. Winds up top this morning were 6-8 MPH gusting to 15ish MPH. By 7AM it had warmed up to high 30's so for two hours I sat static in the dark and was completely comfortable. By 9 AM it was mid 40's and the pants came off and Grumman had to fully unzipped. By 11 AM it was 50 degrees and the winds died down a bit so the Grumman came off.
So far so good. Looking forward to some colder nights in Northern California to test it on next week. Lows are slated for 29-34 degrees and highs only up to the low 50's.
One more thing, if you want to be able to wear the hood and still have the jacket cover your lower back and top of ass while glassing SIZE UP. For the record, I am tall with a long torso and was warned by a buddy who is friends with Kurt at SG to size up. His advice was spot on for taller, long armed and long torso folks.