The Thing received his powers when cosmic rays bombarded his body. The Thing's powers represent the element of earth.
Rock-like Skin: The Thing possesses a smooth, rock-like hide as a result of exposure to cosmic rays. The mutagenic process caused his musculature, bone structure, internal organ composition, soft tissue structure, and skin to greatly increase in toughness and density.
Superhuman Strength: The Thing's primary superhuman power is his great physical strength. Initially, he was only strong enough to lift about 5 tons. Over the years, through rigorous training and further mutation, his strength dramatically increased to the point where he could lift roughly 85 tons. He has continued to exercise over the years using special equipment designed by Reed Richards. It is believed his strength has increased further, sufficient to lift at least 90 tons , and will continue to do say as a future version of the Thing states. However, The Thing has shown multiple feats of strength that would require a strength level far in excess of the ability to lift 100 tons such as successfully holding back a giant alien spacecraft from jettisoning from Earth and stopping a multiple story building (weighing roughly 30,000 tons) from falling over and lifting it back into place.
Superhuman Stamina: The Thing's advanced musculature produces considerably less fatigue toxins during physical activity than the musculature of a normal human. At his peak, he can exert himself for about 24 hours before the build up of fatigue toxins in his blood begins to affect him. Incidentally, The Thing's lungs are of greater volume and efficiency than a normal man's, enabling him to hold his breath underwater for up to 9 minutes, despite the fact that he used to smoke.
Superhuman Durability: The rock-like composition of the Thing's body renders him highly resistant to physical injury. The Thing's body can resist extremely powerful impact forces, such as the force of the Hulk's punches (the Hulk can lift/press far above 100 tons making his punches devastatingly strong). He can also withstand exposure to high levels of explosives, such as being struck full with bazooka shells, without sustaining injury. His body can also withstand extreme temperatures ranging from -75 degrees to 800 degrees Fahrenheit for up to one hour before exposure or heat prostration occurs. However he couldn't withstand being slashed by Wolverine's adamantium claws, and sustained some injury, making adamantium one of the few things that can pierce the Thing's nearly impenetrable body.
Superhuman Sensory Adaptation: Though his senses aren't superhumanly acute, his five senses can withstand greater amounts of sensory stimuli than he could when he was a normal human being, with noreduced sensitivity.
Expert Pilot: Ben is an exceptionally skilled and experienced pilot, proficient with many varieties of both conventional and exotic aircraft
Experienced Astronaut: Ben has also trained as an astronaut and was piloting Reed Richard's spacecraft during the team's fateful bombardment with cosmic rays.
Master Combatant: He is uniquely gifted in the art of hand-to-hand combat (a skill Ben honed long before he became the Thing), though his fighting style tends to be a rather loose brawling technique all his own. This style often incorporates collegiate wrestling techniques, Boxing (as he has been stated to have spent hours upon hours honing his boxing skills in the gym during college), and on at least one occasion even Jujutsu. In his youth, Ben was a talented football player.
Officially listed as Class 90; (originally 5 Tons), now at least 90 Tons. In future the Thing's strength will continue to increase. His feats of strength, however, would indicate the ability to lift in excess of 100 tons.