First Lite Chamberlin has more than twice the insulation of the KUIU and its in whole different category of warmth. You'd literally have to put on two Super Down Pro jackets at once to even come close. The KUIU is much lighter and great for backpacking but the Chamberlin is for when staying warm is the top priority.The kuiu super down pro is the absolute warmest jacket I’ve ever warn. It’s also about the fragilist. Really not a big deal since it’s too warm to hike in but when I do like coyote hunting I wear a vest over it to keep it from tearing. But sitting and glazing it can’t be beat.