evo.com | Sweet Protection Bike Helmets > The Sweet Protection Ripper Junior helmet is built for the smaller, still-developing heads that need real protection without a bulky adult-shrunk shell. Its youth-specific EPS liner uses higher volume, lower density foam engineered around kid-specific head geometry, so impact absorption is dialed for growing riders, not scaled down from a grown-up design. A one-size 48-53cm fit with a simple turn-dial adjustment means less time fussing with straps and more time sending it down the trail. CPSC 1203 Polycarbonate / EPS Foam STACC Ventilation STACC is short for Superficial Temporal Artery Cooling Channel. A front vent, an internal channel, and an exhaust vent cool down the temporal artery without exposing your temples which are the most vulnerable area of the head. Patent Pending. Higher Volume & Lower Density EPS One Size with Large Adjustment Range Fits head circumferences from 48cm to 53cm (18.9 to 20.9 inches). | Kid's Sweet Protection Ripper CPSC Junior Bike Helmet 2026 - 48/53 in White