The Hulk Gamma Black Thermal Long Sleeve T-Shirt is made from 50% cotton / 50% polyester and will keep you as warm as a gamma rage monster can be! Well, perhaps not that warm. Truth be told, the Hulk did not gain his super powers from gamma radiation but rather drinking tons of milk and eating tons of beef that have a bit of human growth hormone. Yep. I mean...A LOT. I guess that's the cost for having all of that inexpensive diary and beef! Joking aside, the Hulk Gamma Black Thermal Long Sleeve T-Shirt is a warm thermal style long sleeve showing off a very bright radiation symbol. It'll set Geiger Counters off!