I'm 5" 11" about 200 and the large fits perfectly. HOWEVER I order large ones to add some length to stay hidden. I highly recommend ordering a larger size if you are my size or larger. Over time, they shrink a little and can shorten a little.
Ultimate Comfort and Style: Minus33 Merino Wool Ticonderoga Lightweight Men's Clothing, T-Shirts & Tanks
43 Review
Hanes Sleeve T Shirt Large White Men's Clothing T-Shirts & Tanks: Premium Comfort and Versatile Style
33 Review
Ultimate Comfort: Discover the Comfort Colors Sleeve 6014 - X Large Men's Clothing, T-Shirts & Tanks
40 Review
Carhartt Workwear XXXXX-Large Men's T-Shirt β Original Clothing for T-Shirts & Tanks
34 Review
Calvin Klein π Herringbone Sleeve Men's Dress Clothing
50 Review
Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
44 Review
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