You will find that the black fabric is lightweight and comfortable.
Kirkland Signature Men’s Crew Neck Tee Shirts HEAVYWEIGHT Cotton White Black
A nice touch: the solid hue here is deep without being too dark.
Men’s Casual Solid Grey Tank Top Sleeveless Athletic Tee Shirt Size N/A
A nice touch: the solid design means you can dress it up or down without effort.
NWT 5 in the Box TANK T Tee Shirts Men Medium M Reebok Colored & White Classic
What I like is the lack of logos, which men often prefer for a clean look.
Men’s U-Neck Sleeveless Sports Tank Top for Gym Fitness Training and Activity
The white here is a soft, wearable white that doesn’t look clinical or stark.