sunsetsailboards said..
interesting that the ARC is 0.3kg heavier than the Super K v2 in the 88/90 size despite not having a handle and being equivalent volume. Arc 88l is spec'd at 5.0kg, Super K2 90l in Pro Carbon at 4.7kg (although my personal board is 5.0kg).
That actually kinda makes sense. A longer, wider, thinner board with equivalent volume will have greater surface area (ie more shell material). And with thinner foam, the shell may need additional reinforcement (more layers or beefier stringers).