Fit and 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 Go Far. Feel Good.(TM) Guarantee Technology: Merino 250 fabric offers breathable warmth, moves sweat away from the body, and provides next-to-skin comfort in colder conditions Additional Details: Size M inseam: 30" (76 cm) Garment Weight: 228 g = 8.04 oz