The Montbell UL Thermawrap jacket is the lightest and most affordable model we tested. All features have been minimized to make a light, clean, very compressible dedicated mid-layer. With no hood and no zippers to close the hand pockets, this a completely utilitarian piece for folks seeking ultralight performance. The UL Thermawrap is lighter than anything other insulated jacket we tested, but also significantly less warm.
If you're looking for a more warmth and the ability to use your insulated jacket as an outer layer, check out the Rab Xenon X Hoodie. We believe The North Face ThermoBall Jacket is the best dedicated mid-layer jacket we tested, though it's more expensive than the UL Thermawrap and more appropriate for colder temps.
A new and improved version of this jacket was made available in 2016. The updates include the addition of zippers for the hand pockets and a zippered chest pocket. Montbell has added stretchy fabric near the wrists for a more custom fit. The fabric in this new version has an updated weave which Montbell says gives added breathability while still keeping the same warmth. The colors and styling have also been updated.Scroll down for a more detailed comparison of the new UL Thermawrap vs. the older 2015 version.