Kuhl chose a superfine merino so it's softer on your skin and naturally odor-resistant. The Innovative AEROKNIT construction traps micro air pockets so it will still keep you warm yet is 17% lighter for the ultimate in temperature regulation. Featuring flat seam construction for reduced bulk, comfort, and ease of layering. Constructed of our exclusive AEROKNIT fabric - a softer, lighter, warmer Merino wool AEROKNIT provides the temperature-regulating abilities, durability, and odor resistance of Merino with a touch of nylon added for strength Articulated design for superior mobility and fit DYNAMIK stitching for increased stretch and strength 1/4 zip design for temperature control Ideal for layering Size XL Pit to pit: 23.5” Length: 27”