hjc i90 modular motorcycle helmet with sena 10b bluetooth headset davan mc5sf large hjc helmets <p>this helmet runs a full size tight - please order one size up from the sizing chart suggestion. if you normally wear a medium in your current helmet, order a large in this model.</p><p>remember, the manufacturer's sizing chart will recommend a tight fit. plus this helmet runs a full size small. use the chart as a reference and order at least a full size up. order 2 sizes up if you do not want a tight fitting helmet. the helmet shop is not responsible for shipping fees associated with exchanging sizes.</p><p>sena smart hjc 10b bluetooth headset pre-installed, charged and tested before shipping. the hjc i90 modular motorcycle helmet has a new sleek design that cuts down wind noise and offers plenty of ventilation. multiple shell sizes means this helmet will look in proportion to your head. single touch vents and sunshield keeps you in control and your eyes on the road.</p><p></p>