Kamper Button Down in CharcoalKamper Button Down in Charcoal The Kamper Button Down in Charcoal by Johnnie O is your go to for cooler dayscrafted from premium ultra soft cotton based flannel that keeps you warm without the itch. A hint of stretch adds comfort whether you're chopping wood or tossing a football. The classic charcoal color makes it easy to dress up or down, and it stands out as one of the best flannel shirts for men this season.