the subject line says it all. I'm assuming my nano-puff if warmer. Both the nano and smart wool come in at about the same weight on my scales. I'm taking my nano-puff instead of my smartwool on a trip tomorrow unless someone gets back to me asap that the reverse is true!

Edited by book on 05/01/2012 19:28:10 MDT.

60g of primaloft and a wind stopping fabric is warmer by far. the smartwool layer breathes, so it wont do much in wind.

my nanopuff keeps me warm down to 40 sitting around with with a light baselayer underneath.

the nano is much warmer

Edited by rbeard on 05/01/2012 19:59:24 MDT.

Thanks Adam; that's my first opinion too. However, either my nano or the smartwool will be worn after hiking around camp as a layer beneath my shell, so wind won't be a factor. Now what say you?

Edited by book on 05/01/2012 19:36:33 MDT.

The Nano puff, no question. (And I do have both.)

Thanks, Sumi. Nano it is!

It would take two or three of those Smartwool tops to get close to the Nano Puff.