Smartwool W CLASSIC THERMAL MERINO BL PATTERN BB 100% Merino can do anything. Women’s thermal underwear: The Smartwool W CLASSIC THERMAL MERINO BL PATTERN BB are ready to face any challenge. Highly functional with flatlock seams that minimize chafing, and a fit that fits everyone, there's never a shortage of comfort. Get yourself at least one pair of these great trousers from Smartwool and enjoy the winter in peace and warmth. Smartwool W CLASSIC THERMAL MERINO BL PATTERN BB