The Smartwool Merino 250 baselayer bottoms offer warmth and breathability in fluctuating temperatures. They are constructed entirely of merino wool, which helps maintain comfort whether the climate on your outdoor adventure is warm, cold, or somewhere in between. Moisture-wicking properties keep you warm when you sweat in the heat, while the snug fit keeps you warm in the cold. The flatlock seams and wide elastic waistband are also designed for your comfort. 100% Merino Wool. Interlock knit. Elastic waistband for comfort and a flattering fit. Flatlock seam construction designed to eliminate chafing. Anti-microbial. Moisture-wicking. Natural Mid Rise. Best for: Mountaineering and Alpine, Bike packing. Inseam: 30 in. . Fit: Slim fit. Product weight: 6.7 oz. Care: Machine wash warm. Tumble dry low. Imported.