Style over speed. Designed to meet the needs of today's progressive trail riders, the Tyrant™ Mips® helmet has attitude and innovations that usher in the modern era of progressive biking!- - - - -Construction:Hardshell with In-mold polycarbonate Hardbody™ lower wrapProgressive layering with EPS outer liner and EPP inner liner- - - - -Visor: Tool-free, bolt-on visor- - - - -Ventilation:14 vents with internal channelingChanneled Stack™ ventilation at brow line- - - - -Fit System:Roc Loc® Air DH- - - - - Product Weight: 600g (size Medium CPSC, CE)- - - - -Certification:Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and OlderE.U.: CE EN1078 - - - - - Highlights:Goggle compatibilitySpare set of cheek pads included for fit tuningCheck pad ventilationStack™ ventilationQuick-dry padding - - - - - S 51 - 55 cmM 55 - 59 cmL 59 - 63 cm- - - - -HOW TO ADJUST THE FITStep 1: If the helmet has one, adjust the fit system at the rear of the helmet for a snug, secure fit. Some fit systems also include a vertical tuning feature that allows you to adjust the fore/aft tilt, for optimal positioning on your head.- - - - -Step 2: Adjust the straps so that they sit just below the earlobes.- - - - -Step 3: Adjust the buckle so that it rests against the back of the jaw/throat.- - - - -Step 4: Adjust the interior pads if needed.- - - - -Step 5: Check the fit to make sure helmet is comfortable and secure. It should not roll forward or back, or be able to slide off.