Manufacturer's product description:

https://www.first-spear.com/padded-agb-sleeve-6-12-tm-low-profile

 

Imported this from the states many years ago, only used once, basically new condition.  Ranger Green.  Is a medium, measures 34" end to end, requires an inner belt to use.  Allows mounting of any holster or pouch whether they use traditional PALS/MOLLE, 6/12 or belt mounting solutions since the inner belt can be woven to the exterior at any point desired.  Has an inner velcro interface to secure to a loop/soft velcro covered trouser belt.

 

Close-up example pic of how you can set stuff up on this belt rig: