I don't usually take the time to write a review but this product is so terrible I have to warn others. First I ordered a 3XL (I usually wear 2XL but needed more room), it fit like a medium, my arms were tight and I felt like if I sneeze too hard they might fall apart. I don't know what material it is, but it itched like hell too. Totally disappointed in this purchase and would advise anyone looking for Thob to look elsewhere as this is not the place.