A staple for any mountain biker. The Sierra flannel is made from an ultra-soft 60% Cotton and 40% Polyester blended fabric, with a small SDG woven pocket tag.  The Sierra is built durable and includes two front pockets, double layer back yoke, button front closure, and rollup sleeve vents. *The Sierra flannels run slightly large - we recommend you size down if you're in-between sizes.