craigrukswrote a review of Patagonia Nano Puff Hooded Insulated Jacket - Men's on February 2, 2015
Familiarity: I've used it several times
Fit: True to size
Have worn this jacket almost every day for the last two months. Used for travel in multiple climates as well as skiing. Packs small, weight is great considering its synthetic, and most importantly, it regulates heat way better than my down puffy. Have found it effective at keeping me warm from mid teens up through the fourties no problem. I also carry a Marmot Mica, which pairs well with this as a shell to protect from heavier rain/wind.
Fit is great for me. I have a Cochineal Red size medium, and I am 6'1", 34/35" arm length, 40L jacket length. The arms are long enough! And fit is really good.
Hope this helps!