The Arai Quantum-X Sting Black Frost Helmet is the perfect street helmet for riders that have a round-oval head shape. Arai Quantum-X Sting Black Frost Helmet – MSRP $829.95 Arai Quantum-X Sting Black Frost Helmet: Construction The Quantum-X features Arai’s new Peripherally Belted Super Complex Laminate Construction (PB-ScLc) shell design for great protection and affordability. Ventilation […]