I have the Kelvin lite jacket and it's been a great piece of gear, it is super light, very comfortable and surprisingly warm for how little insulation there is in it. I've layered it under rain gear, the 90% jacket, a fleece jacket and just a camo shirt and in all kinds of temps and conditions, the Kelvin Lite jacket will always have a place in my pack. It's also my pillow! Even though I have had the lite jacket in some pretty dam cold temps I am fixing to pull the trigger on the Kelvin for my frigid hunts, I hope I like it as much as I do the Lite