For wider freeride mountain bike tyres this is a high quality Schwalbe 650b x 2.1 to 3.0 " inner tube.
Why choose this inner tube?
Because a tube is not just a tube.
Schwalbe test all tubes (twice), including inflation for 24 hours to ensure they don't lose air pressure.
Less lost air means less time inflating and more time for you, whether it's bombing down a mountain, in bed before work or at the office.