This shirt’s solid look is perfect when you want to keep things low-key.
Reel Life Tshirt Mens Size XL Short Sleeve Relaxed Fit Graphic Double Sided New
A nice touch is how the graphic print is slightly faded for a worn-in look.
CAT Caterpillar Men’s Relaxed Fit T Shirt, Color Gray, Size Medium, Durable. 
This T-shirt is a solid piece, meaning it’s a reliable choice every time.
Human Made Shirt Large Nigo Heart Logo Plain Basic Grey Streetwear Tee
The gray tone here is exactly what you want in a dependable tee.
Nike Mens Workout Shirt Black White Tight Athletic Fit Short Sleeve Sports Gym
You will appreciate the solid color for its versatility and timeless appeal.