Jeans are usually made from a heavy cotton cloth called denim.
VOA: special.2011.08.12
Having verified that the cords are pulled taut and solidly knotted, they envelop the woman in a large sack of heavycloth and push her ahead of them into the corridor.
Heavycloth interacts realistically with the player as he walks through it, dynamic shadows cast from flashlights and enemies paint the scene with an eerie atmosphere, and crates tumble and explode realistically.