The SMK Streem has an aerodynamic EIRT (Energy Impact Resistant Thermoplastic) helmet shell and has 2 different sizes of helmet shells that ensure a comfortable and connected fit. Removable and washable lining, antibacterial and neutralizes unpleasant odors. Ventilation system for maximum cooling and optimal concentration. Visor offers 100% UV protection and has an anti-scratch coating. Extremely wide field of vision. Microlock chin strap closure.