For a more fitted style, the small size works great under a jacket or blazer.
Superman Classic Logo Tank Top
What stands out about this regular fit is its consistency across different colors.
Drift Master Imported Tuned Custom JDM Sports Car Tank Top
What stands out about the small is the way it sits flat on your back.
JDM Culture Street Legend Imported Tuned Custom Sports Car Tank Top
If you are between sizes, the small runs slightly smaller than average.
Street Racer Imported Tuned Custom JDM Sports Car Tank Top
A nice touch is that the small size keeps extra fabric from bunching up.