Motorcycle helmets and some other protective equipment have a hard outer shell for precisely this reason: even if you hit a kerb, the impact of its sharp edge will be spread over a wider area, instead of piercing your skull
SB (which stands for Special Blend) means that the pack has some unique features not to be found on a regular version an internal laptop/hydration sleeve, in this case
The helmet in no way gives that impression, either in handling it or riding with it and it seems that AGV took just as much care in the design and manufacture of this model as it does for any other, no matter the price
Its large panoramic screen, offering a wide 190 horizontal field of vision, is predisposed to receive Pinlock Max, a high-performance anti-fog film available as an option on iCasque
If there is one downside to this pack, its the large size