Extremely light. The large volume can be ridden with extremely low air pressure. 
 
Open tread with medium stud height for excellent rolling resistance and low weight. Ideal on soft ground, rough and very loose terrain.

It's lighter than you think. At 990 grams the 4.0" Liteskin  version is less than a kilo. 

Jumbo Jim loves extreme conditions: gravel, loose sand or deep snow. According to Marcus Lambertz, the Schwalbe Product Manager in charge: "The only solution in these cases is a large volume combined with an extremely low air pressure starting at about 0.4 bar. This generates the optimum traction needed for propulsion."

In the standard version, Jumbo Jim is Tubeless Easy and has a SnakeSkin* sidewall. Alternatively, there is the lighter LiteSkin version.

*No actual snakes harmed in the making of this tyre. Don't laugh, we were asked once.