This is an officially licensed Karate Kid product.
This shirt features the Cobra Kai logo and says "Sweep The Leg" on the back.
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.