Arai addresses the different head shapes in the North American market by releasing the Quantum-X and Signet-X. No, one size doesn’t fit all.
Arai QUANTUM-X PEARL BLACK Helmet Review
Arai Signet-X and Quantum-X Helmet Review
Arai Head Shapes: Quantum-X & Signet-X
Arai Signet-X and Quantum-X Review
Arai Head Shapes: Quantum-X & Signet-X
Arai Helmet Review
REVIEW: The New Signet-X and Quantum-X Are Arai's Answer for Different Head Shapes
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Arai Head Shapes: Quantum-X & Signet-X
Arai Quantum-X Oriental Helmet