The Ardent Air is the warmest midlayer performance quarter-zip we offer. Developed with a lightly brushed, incredibly soft stretch ribbed fleece, with a heathered aesthetic that sets this especially mobile piece apart. Details Men's 88% polyester / 12% spandex pullover Our warmest midlayer option Stretch construction Machine wash cold with like colors; tumble dry low Fit Classic Fit Model is 6'0", wearing a size Medium