You will find that the long sleeve shape stays smooth even after sitting.
Under Armour Men’s UA Tech 2.0 Long Sleeve Shirt Black M NWT 1328496
You will find that a solid T-shirt like this one is a wardrobe workhorse.
Under Armour 1328496 Mens Athletic Training UA Tech 2.0 T-Shirt Long Sleeve Tee
A nice touch is the side slits on this t-shirt.
UNDER ARMOUR Men’s Gray Long Sleeve Poly Tech 2.0 T-shirt. Sz. Large. * NWT *
You will notice the solid shade adds a touch of sophistication to casual wear.
Class 2 Max-dry Moisture Wicking Mesh Long Sleeve Safety T-shirt, Neon Orange
What I like is the lack of logos, which men often prefer for a clean look.