The t-shirts are very high quality dye sublimation with a wicking material. The t-shirts are a flexible / soft feel material that will feel good to wear and last a very long time. Please refer to the U.S Sizing chart for your shirt size.
The background of the drop bear story is from the Vietnam war era when the US troops were stationed in Australia. Australians told the US troops to watch out for the Koala bears in the trees (an Australian native marsupial similar to a miniature bear that sleeps 23 hours a day) as they might become vicious and drop out of the trees and onto the heads of unsuspecting victims……hence the name Drop Bears.