I think its worth pointing out that the American shirt has the option to print on the Teespring Premium T-shirt, while the yellow prints on a Hanes shirt.
The Teespring premium shirt is SUPER soft and comfy. Everytime I wear it, my wife compliments how soft the shirt is.
The Hanes shirt is just a regular tshirt.
Neither have shrunk for me, which is the most important part.