Smartwool updated their base layer to bring you the Smartwool Men's Classic Thermal Merino Base Layer Pants. The technical benefits of 100% merino wool will help keep your game at a higher level for longer. Smartwool's heaviest, weighted wool will help keep you warm and comfortable as you ski, run, and hike the day away. Merino 250 is softer and offers breathable warmth while moving sweat away from the body. Allow the Classic Thermal Base layer to provide next-to-skin comfort and better fit in colder conditions.FeaturesSlim Fit100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and natural odor resistanceFit updated to improve functionality while enhancing aestheticsMerino-covered elastic interior waistband and traditional fly designFlatlock seam construction designed to minimize chafing100% Merino WoolGarment Weight: 228 g = 8.04 oz