The Smith Sidekick Jr. Mountain Bike Helmet brings grown-up style and protection to the youngest shredders in the family. Whether they're ripping through the pump track, cruising the sidewalk, or tackling mellow trails, this helmet delivers the same Mips® Safety System trusted by adults—reducing rotational forces during angled impacts. The lightweight in-mold construction blends a tough outer shell with EPS foam for durable, low-bulk coverage, while 12 fixed vents keep the air flowing as the ride heats up.
With extended coverage at the back of the head, a built-in visor, and Smith’s AirEvac™ system to keep goggles or glasses fog-free, this lid doesn’t cut corners on style or function. The dial-adjustable fit system makes getting the right fit a breeze, and the two youth-specific sizes ensure comfort from their first pedal strokes to their first trail drop-ins. From look to feel to safety, the Sidekick Jr. is ready for every young rider’s next adventure.
Features
Mips® Safety System for protection against rotational forces from angled impacts
In-mold construction for lightweight durability and a sleek, low-profile fit
Extended back coverage offers enhanced protection for growing riders
Two youth sizes: X-Small (48–52 cm, ages 4–8) and Small (51–55 cm, ages 8–12)
Adjustable dial fit system for a secure, personalized fit
12 fixed vents provide steady airflow during active rides
Integrated visor helps block sun and trail debris
AirEvac™ ventilation system works with Smith eyewear to prevent fogging
Performance comfort liner adds cushioning and sweat management
Lightweight, low-bulk webbing improves comfort and ease of wear
Weight (Size M): 310 g
Certified to CPSC, CE EN 1078, and AS/NZS2063 safety standards
