I never thought about Simms. How is the length/fit in comparison to the Kelvin Lite?
I have the the Kelvin vest not the lite.
The Simms is lighter and thinner, it rolls down and pack pretty close for what it is. The fit is true to size and not overly slim at all..length is just at or a hair below your waist. I wear XL and it earlier fits over my first two layers and then under a hard or soft shell. In the winter its a go to item over a sweatshirt wearing it for everyday stuff.
For the money, ( 85 ish on eBay new) it's a hell of nice piece. Honestly I like a lot of what Simms puts out, some of there soft shells with windstopper are nicer for hunting then a lot brands that just label hunting clothing.