I have bought many shirts as a guy who has worn them 4 times in over 15 years. Most are very thin. They are thick with no tags and fit well. They're not soft if that's what you're looking for, but they're very durable. I bought two and will buy more.
Ultimate Comfort and Style: Minus33 Merino Wool Ticonderoga Lightweight Men's Clothing, T-Shirts & Tanks
43 Review
AM Fitted T Shirt 3 Pack for Men's Clothing - T-Shirts & Tanks
46 Review
Carhartt Workwear XXXXX-Large Men's T-Shirt β Original Clothing for T-Shirts & Tanks
34 Review
Men's XXL Super T Mockneck π from Lands End - Clothing, T-Shirts & Tanks
32 Review
H2H Mens Casual Slim Fit Short Sleeve T-Shirts Cotton Blended Soft Lightweight V-Neck/Crew-Neck
46 Review
INFLATION Bamboo Shirts Sleeve Elastic Men's Clothing in Shirts
45 Review
Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
44 Review
π Nantersan Placket Raglan Tee - A Casual Must-Have
52 Review