I'm 5'6" and 4120 lbs, medium fits me. In fact, I'm somewhere between small and medium. But the product is very satisfied, no complaints.
H2H Mens Casual Slim Fit Short Sleeve T-Shirts Cotton Blended Soft Lightweight V-Neck/Crew-Neck
46 Review
Men'S Long Sleeve Polo Shirt - Slim Fit, Stretchy, Breathable Collar
43 Review
Men'S Regular Fit Short-Sleeve Dress Shirts By Allsense - Look Stylish And Professional!
41 Review
Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
44 Review