R1 Air Zip Neck Men's

I wore this on a cold morning hike and the lightweight warmth was just right without making me overheat. The zippered neck makes it easy to dump heat when I start climbing steeper sections.

The zigzag grid pattern on the inside traps warmth without adding bulk, and it’s light enough to wear under a shell on chilly morning runs. Surprisingly, the zip neck makes layering easier than I expected, and the whole thing breathes just right for active use.

Finally got this and wore it under a shell for a cold morning run — it breathes surprisingly well even when I’m working hard. The zip neck is perfect for dumping heat without taking the whole layer off. That unique fabric structure really does make it feel lighter than my old fleece.