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5mm hex socket- nominal 7
Built in padding at hips offers additional protection
Certification CE - CPSC - AS
four-way stretch knit of the Siren can be used with any of the liners in your closet
100 Percent Altis Gravel Helmet - L/XL - Black YGroup_7034186661933 these are the answerThe new 100% Altis. Engineered for the demands of the modern day gravel rider. Lightweight, breathable with class leading performance and safety all with a modest budget in mind. Who's this item for: This is marketed as a Gravel helmet but it's just as well suited to XC, Trail, and Road riding. Construction: High Density EPS foam injection and moulded with polycarbonate. Rotational liner: The Altis uses the Smartshock Rotational Protective System
