Good preowned condition Smartwool's best selling and warmest base layer ever, just got a little more refined with an improved fit, chafe-free seam construction and panels that offer more comfort with a pack Slim fit 100% Merino Wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance Crew neck with set in sleeves Back body seam wraps to front for body-enhancing fit Shoulder panels eliminate top shoulder seams Flatlock seam construction designed to minimize chafing