NickyGwrote a review of Arc'teryx Nuclei SL Insulated Jacket - Men's on July 3, 2017
Familiarity: I've used it several times
Fit: True to size
This light insulated jacket is perfect for layering under a shell in really cold conditions, or as an outer layer in cool to cold weather. One correction - it has 60g of Coreloft throughout, not 80g in the body as described. The Nuclei Hoody and Nuclei FL jacket have the extra torso insulation. IMO, this makes the SL more versatile here in the SW, where temps rarely get below 15 degrees. For its weight, it's impressively warm. Breathability is adequate unless you're really working hard, but it does block 100% of the wind, so I prefer it as an outer layer, especially in windy conditions.
No other insulated jacket I've tried fits quite as well as this Arcteryx piece. The fit is perfect for long, lanky critters like me. This has become my favorite light insulated jacket. Plus, it looks really smooth!