Alpinestars MX Youth/Kids cross helmet SM3 Radium Fluor Yellow / Black / Blue 2026 collection
4.4 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
- SKU
- MXW_MX115126
- Brand
- Alpinestars
- Availability
- In Stock (2)
- SKU
- MXW_MX115126
- Brand
- Alpinestars
- Availability
- In Stock (2)
FULL DESCRIPTION
Alpinestars SM3 Youth cross helmet in Radium Fluor Yellow / Black / Blue is a youth helmet, anatomically engineered for young riders and optimized for MX, Enduro and Off-road use.
Alpinestars SM3 Youth Helmet Specifications
- Brand: Alpinestars
- Product type: Youth/Kids cross helmet
- Model: SM3
- Design: Radium
- Colour: Fluor Yellow / Black / Blue
- Collection: 2026
- Sizes available: Youth Small, Youth Medium and Youth Large
- Weight: 1060 g
Alpinestars SM3 Youth Helmet Features
- Thermo-injected outer shell in advanced impact-resistant thermoplastic
- Youth Medium and Youth Large share the same EPS shell size; fit adjustable via crown and cheek pad spare parts as the rider grows
- Youth Small has a dedicated smaller EPS shell, adjustable via cheek pads only, designed for riders typically aged 3-4 years
- Multiple density inner liner for correct impact absorption per zone and reduced weight
- Inner and outer surfaces engineered to minimize oblique impact effects
- Alpinestars patented low-friction coating on the inner EPS liner reduces rotational acceleration forces
- 10 intake and 7 exhaust ports for maximized ventilation
- Visor designed to direct airflow into the ports
- Patented visor release system reduces forces on the rider's neck during impact
- Comfort liner made from recycled materials
- Hydration tube channels integrated into the cheek pads
- Soft textile chin strap, 25 mm
- New in-house Alpinestars standard for chin bar testing beyond homologation requirements; shell thickness and structure optimized in the chin area
- Emergency Release System with removable cheek pads for safe removal while helmet is worn
- 3D contoured foam for comfort
- Stainless steel D-rings for a secure fit
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
Call or email us with your make, model and year and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.