A Cincinnati store that made custom Damar Hamlin shirts in the wake of the Bills safety's medical crisis tells TMZ Sports it's made $50K off the tees ... and is now planning on donating all of that cash to DH's Chasing M's Foundation.
Cincy Shirts put together three designs after the scary incident on Jan. 2 ... when the 24-year-old collapsed and went into cardiac arrest during the Bills vs. Bengals "Monday Night Football" game.
One shirt reads "More Than Football" with Hamlin's #3 jersey number.