Smartwool has updated their Men's Classic Thermal Merino 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 their heaviest weight wool fabric will help keep you warm and comfortable as you ski, run, and hike the day away. Fit & Design: 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 Garment Weight: 228 g = 8.04 oz