This is an officially licensed Angry Birds product.
This t-shirt features an Angry Bird with a bowtie and glasses and says "Nerdy Birdy"
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.