A nice touch is the undershirt’s ability to resist yellowing under the arms.
UPF50+ Men’s Long Sleeve Fishing Shirts UV Protection Hoodie Casual Sport Shirts
I appreciate that the S to 2XL range includes both slim and relaxed fits.
Men’s Cotton Blend Heavyweight Long Sleeve Crew Neck Shirt ( Sizes, S-3XL ) NWT
This shirt has a classic long sleeve that never goes out of style.
Licensed Men’s Relaxed Fit Soft Graphic Band Short Sleeve Tee
What I like is how it fits men of average build without being baggy.
Men’s Short Sleeve T-Shirt Red W/ Patriotic Truck Graphic Size Medium
The graphic print on this tee is subtle enough for casual Fridays at work.