Icebreaker Men's MerinoLOFT Helix Hooded Jacket

Backcountry.com says:
Thanks to the Helix Hooded Jacket, we can stop messing around with midlayers that end up feeling too bulky halfway into a winter workout. MerinoLoft insulation lends this layer the feel of a lofty puffy, helping hikers, backpackers, runners, and anyone else trying to stay active in the cold stay warm without the weight. Unlike down, merino wool comes with the ability to regulate body temperature, so both the insulation and lining balances warmth with breathability to keep us comfortable.