Ultra-light materials, wear light, wind tunnel, duct design, effectively reduce wind resistance. Internal structure: High-quality foam layer, the adjustment within the twist, you can adjust the size of head circumference. Adjustable and removable visor and visor plugs make this bike helmet perfect for on-road or off-road use many channelled vents bring cool air in through the front, allowing it to pass over your head and then flushes warm air out of the rear ports the strap is adjustable to most fit you proper size: For head circumference 57-62 cm dimensions: 32. 5x21. 5x14(cm) / 12. 8x8. 5x5. 5(inch) breather: 19 holes material: Pc +epc colour: Red package include: 1 x bicycle adult mens bike helmet
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