Based on the shirts in season 2
It's a Polycotton T-shirt or Sweatshirt and the image will never wash out or fade as it has been embedded into the fabric. They are applicable for men and women (women often buy the size below).
SIZE GUIDE (representative of chest size in inches)
S - 36-38 M - 40 L - 42 XL - 44 XXL - 46-48
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