These are velcroed into position and sized according to arm length. Fixed to the inner layer of leather (See armour for more details).
The unofficial classification given to the level of performance achieved by BKS impact protectors, going even further than the Cambridge Standard High Performance figures for CE Approval
> CE standards allow a pass at 50 joules.
> High Performance is awarded at 75 joules
> Ultra High Performance at 85 joules
> Extreme Performance at 90 joules