The Nike ACG Therma-FIT ADV Windproof Canwell Glacier Full Zip is literally named after Alaska's Canwell Glacier, which is where Nike stress-tested this thing. Made from superplush fleece with Therma-FIT ADV tech that heat-regulates while you move, this jacket fights off frigid air with a stand collar and elastic hem that lock in warmth, so you're not leaking heat everywhere. Built as part of ACG's nesting system so you can stack layers based on conditions and activity level, proving that serious cold-weather gear is about smart layering, not just one oversized parka doing all the work.