When lightweight, reliable warmth is a necessity, our Iso fleece jacket delivers for all your missions outside. Merrell Aeroblock provides high wind-resistance and breathability. 100% polyester. 37 CFM. Merrell Conductor fleece provides versatile heat retention in varying conditions. Merrell N.A.D.A. Dye-free colorway option Secure zip hand pockets. Stand-up collar design adds clean look and reduces bulk when layering. Textured binding adds interest and style.