We've updated our Men's Merino 250 Base Layer Bottom to bring you a better fitting, more functional tight. The technical benefits of 100% Merino wool will help you keep your game at a high level for longer. And our heaviest weight wool fabric will help keep you warm and comfortable as you ski, run, and hike the day away.BenefitsMerino 250This heavier, soft, 100% Merino wool fabric offers breathable warmth, moves sweat away from the body, and provides next-to-skin comfort in colder conditionsFeatures Slim Fit 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance Fit updated to improve functionality while enhancing aesthetics Merino-covered elastic interior waistband and traditional fly design Flatlock seam construction designed to minimize chafing Care Machine Wash Warm Gentle Cycle. Do Not Iron Decorations. Do Not Bleach Tumble Dry Low Cool Iron As Needed Do Not Dry Clean Wash With Like Colors