In the sport of bodybuilding when someone doesn't do steroids they're generally referred to as natty (natural). It's a personal preference. Honestly nobody really cares. Kinda like people proclaiming their veganism. The higher you climb in the ranks of the sport the lower the percentage of natties. This shirt is for those proud natural competitors and athletes of any sport who decide to remain PED free. Cause you can get some nasty sides. We even made a shirt about it. Check it out. Steer clear my natural friend!