A nice touch is the vented back panel on this t-shirt.
Under Armour 1326413 Men’s UA Tech 2.0 Short Sleeve T-Shirt, Red, X-Large
Under Armour t-shirts hold their shape after repeated wear.
Under Armour Tiger Tech 2.0 Mens Training Loose Fit T-Shirt 2XL New Tags
A crew neck is a classic choice, and this one does it right with soft stitching.
Under Armour 1326413 Men’s UA Tech Tee 2.0 Short Sleeve T-Shirt, Red, Small
What stands out about Under Armour is the moisture management.
Under Armour Athletic Training UA Tech 2.0 T-Shirt 2XL Short Sleeve Tee 1326413
A nice touch: the solid color makes it easy to layer under a hoodie or blazer.