I second Smartwool. Â We all have their long underwear and wear them constantly. Â We wear them as PJs at night and under our clothes during the day. Â
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When it dips into the -30 C range, I am bundled in Smartwool long undies, a long T-shirt, a wool sweater and a down coat for out doors. Â A heavy scarf and hat. Â Wool mittens with a waterproof outer layer. Â Wool socks and Sorel boots. Â Nice and toasty! Â Â





