What stands out about the small is the tailored armhole that doesn’t gape.
House of 1000 Corpses Mesn T-Shirt – Captain Spaulding Museum of Monsters
You will notice the small size allows full arm movement without pulling.
Star Wars Mesn T-Shirt – Speckled B/W New Hope Poster Image
What stands out about the small is the collar that doesn’t stretch out easily.
Jay & Silent Bob Mesn T-Shirt – Mooby’s the Golden Cow Resturant Logo
The blue is a darker shade, which helps it resist showing dirt.
Spider-man Mesn T-Shirt – Green Tinted McFarlane Cover Art
A nice touch is that the small size has a consistent fit across colors.