Yes I do, but it also depends on the weight of the wool. Midweight Smartwool is a lot more bulky than the lightweight version, I stick with Smartwool socks and their lightweight balaclava feels great and is fantastically warm for the weight as are their beanies and neck gaiters. When my Smartwool long underwear develop holes (as my Smartwool stuff does more quickly that I'd like for such expensive stuff) I'll go over to the Techwick alternative and just wear Smartwool on my head and feet.