The Flannel shirt is a multitasker. Wear it to work, on a date or when out hiking. No matter when you wear it you will look great! Compared to the Boulder flannel shirt, the Sonora is a lighter weight flannel shirt suitable for work, yard work, hunting, wood chopping or even on a date. The Sonora flannel shirt is made out of soft cotton. A lightweight flannel that looks great and stands up to anyone's active lifestyle. Soft and versatile, you can wear the Sonora shirt from the office to outdoors and everywhere in between.