50% cotton 50%polyester and 15% ecologically hand-sourced bat guano (jk for lawsuit reasons)! These shirts are screen printed by me in the cave. The back of the shirt features the BCB logo. The front of the shirt is blank. I print these in a variety of colors. Please put your color choice in the special comments section of your order and I will do my best to accommodate. If your requested size and color combo is not available I will let you know. Please be aware orders placed without a color preference will receive a RANDOM color.