RE: wool underware??? Smart Wool,Justin Charles, Klar...ect
 

Ideally you would go to a retail store where you could see the difference between the two weights.It would be worth checking on smart wools web site to see if they have a retailer in your area.I have had my smart wool stuff for a number of years and honestly don't know what weight it is.My assumption is that it is the midweight stuff because it is seriously warm.

It is great stuff!