This is an officially licensed Nintendo product.
This shirt features Mario dancing from DDR: Mario Mix. The artwork is printed onto a super-soft t-shirt using a lithograph process, which allows for high quality images.
Sheer t-shirts are made of a soft material and are slimmer fitting than your average t-shirt. Sheer t-shirts are generally made of a cotton/polyester blend, but may also be 100% cotton. The shirts are not see-through nor is there any loss of quality.