If you know Duluth Clothing, then you know: this is a well-made, durable, comfortable, good-looking shirt! This is from their Free-Swingin' line due to the back shoulder blade vents (shown) and the underarm gussets which are designed to give flexibility when you are working, stretching and reaching. The fabric is a mid weight, not a fuzzy flannel, but probably still qualifies as a cotton flannel due to the weave and weight. Size is Large. (I'm only selling because I would like to find an XL to replace.) GREAT shirt - you're gonna love it! ----->P.S. Check out other items for sale in my closet ~ Bundle and save!