What Is the Difference Between Muscle Fit and Athletic Fit T-Shirts?

Muscle and athletic fit are marketing terms without universal measurements.

Men's performance garments need fit standards based on the intended body proportions and activity. Chest, shoulder, waist, and movement requirements should be evaluated together; generic size names or a familiar silhouette do not establish whether the garment will remain comfortable during actual training. Specify actual ease and target-body dimensions.