Was told to go one size down if teetering between two sizes - not - stick with your real size especially between large and XL. This is an OK shirt - not a $40 flannel shirt - it is pretty thin - I'm not sure what 6oz Flannel means but it must mean pretty thin in comparison. Yes better quality than a $10 Walmart Flannel but less than a $30 TSC flannel. Learned my lesson - to lazy to return