You will find that the 3XL works well under a flannel shirt.
Los Pollos Hermanos Restaurant Logo Men’s T-Shirt
A nice detail is the ribbed collar, which stays flat on men’s necks.
Transgender Planet Trans Pride Nonbinary Men’s T-Shirt
This shirt feels substantial, made for men who want something that lasts.
Pack Of 6 Shaka Wear MHS Mens Max Heavyweight Short Sleeve Oversized T-Shirt
Shaka Wear doesn’t use those thin, see-through materials you see elsewhere.