I didn't read the rules for the most recent Cup but previous editions have limited the allowable materials and processing techniques in the rules, setting a lim

I didn't read the rules for the most recent Cup but previous editions have limited the allowable materials and processing techniques in the rules, setting a limit on fibre modulus to prevent the better funded teams from going all out on eye-wateringly expensive M55J carbon for example. Cure pressures were limited to 1 bar vacuum (atmospheric) to keep the rich guys out of big and expensive autoclaves for their hulls and primary structure. There was a maximum density requirement for the keel bulb material forcing you to use lead rather than platinum, gold or depleted uranium! These (nano? micro? mini?) fibres would likely be used as an additive to the resin, then laminated with everyday carbon - usually the first failure method to occur is resin microcracking which these little guys could helpfully and cheaply delay.