Nano Puff vs Nano Air

The Nano Air is intended to be worn while active and is similar to a fleece in intended use, the Nano Puff is intended for static use or slow low aerobic activities.

You may already know that and I know it doesn’t answer your question but I feel it is kind of apples and oranges.

check the forums for clo value comparison for exact numbers. primaloft gold is the warmest synthetic (.92/.9 dry/wet i think), but the nano has gold eco, which is a bit lower (.60s maybe?). fullrange is in the .50s if i remember right.

fullrange has the benefit of more loft and no baffles, so feels a bit warmer as a mid layer. my nano air light (40g fullrange) feels warmer than my nano bivy (60g gold eco), but only under a shell.

face fabrics are very different. nano puff has inner and outer nylon; nano air uses super breathable toray stuff. as an outer layer, the nano air lets more wind through (even with fewer baffles). standing in no wind, air might be a little warmer, even as an outer layer.

i got the nano puff [bivy] on a great sale, but would not buy it again because of how versatile the nano air is. not sure if the sale is still going on, but you can occasionally get the nano air for 50% off.

I actually reinvested in a Nano-Air recently, and sold my Nano-Puff like 2 months ago.

Between the two the Nano-Air is more versatile across more conditions. I regard the Nano-Puff as a good belay sweater, or something you wear around town or base camp, but it’s brutally non-breathable for anything active. You’ll be drenched under it very quickly once you get moving. Nano-Air is not as wind and weather resistant, which is expected in an active insulation piece, but under a shell I find the Nano-Air to be warmer and more comfortable against the skin.

If you want an active insulation piece that is breathable, and still want weather resistance but don’t want to be wrapped in a plastic bag, try the Black Diamond First Light Hoody. It’s like a Nano-Air mated to a BD Alpine Start.

Thanks for the replies.