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Ships within 48 hours · Estimated delivery Aug 15 - Aug 20
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Description
Alpinestars SM3 Helmet - Radium - Gloss Black/White/GrayFeatures Varied thickness shell construction for optimized protection and light weight Optimized for MX, Enduro, and Offroad use Delivers blend of performance, protection, and comfort Key Features Features thermo injected shell incorporating a polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight Lightweight outer shell is constructed from impact resistant
Features
- Varied thickness shell construction for optimized protection and light weight
- Optimized for MX, Enduro, and Offroad use
- Delivers blend of performance, protection, and comfort
- Key Features
- Features thermo-injected shell incorporating a polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight
- Lightweight outer shell is constructed from impact resistant thermoplastic
- Inner shell constructed with a composite fiber assembled between the outer shell and the EPS liner for maximum protection against impacts
- Fit can be tailored to the rider's head thanks to the helmet's crown and cheek pads
- Construction
- Multiple density inner liner ensures the helmet is equipped with the correct density in the correct area for enhanced impact absorption, while also helping to reduce overall weight
- 6-piece EPS liner with five densities to effectively manage volume and impact performance
- Polished inner EPS liner with special coating to reduce friction with comfort liner for rotational impact management
- The inner and outer surfaces are engineered to minimize the effects of oblique impacts
- Low friction coating is applied to the inner part of the main EPS liner to reduce the rotational acceleration forces that can result from certain oblique impacts
- Maximized ventilation and high levels of heat transfer exchange thanks to ten inlets and seven exhaust ports
- The visor has been designed to direct air into the ports for enhanced airflow
- Visor release system ensures the visor is released with the correct pre-determined amount of force, effectively reducing the forces on the rider's neck during an impact
- Comfort liner is constructed using recycled materials for a lower carbon footprint
- Hydration tube channels are integrated into the helmet's cheek pads for convenience and performance
- Soft textile chin strap is 25 mm for optimal safety and rider comfort
- Protection
- Equipped with an Emergency Release System and removable cheek pads to permit the safe and easy removal of the cheek pads while the helmet is still on, while the 3D contoured foam ensures rider comfort
- Chin area optimized for superior impact performance
- Stainless steel D-rings ensure a tight and secure fit
Certifications
- Conforms to both DOT certification and ECE 22.06 homologation
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
Great shoe!
Size: 5.5 Big Kid, Color: (106) Castlerock/Anthracite/Phoenix Fire
Great fit, very durable, excellent foot support, lots of great colors to choose from. We have had these for over 6 months and thy have not overstretched or come apart in any way. I am really pleased with these shoes for my child who is VERY hard on shoes and usually has sensory issues surrounding shoe comfort/tightness.
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Reviewed in the United States on December 28, 2025
★★★★★ 5
Great fit for kids
Size: 10 Toddler, Color: Light Grey
We purchased the RUNSIDE Boys Girls Tennis Shoes for my child and have been really happy with them. They’re super lightweight and breathable, which is great for all-day wear and running around. My child says they’re comfortable, easy to put on, and don’t make their feet hot.
The shoes seem durable so far and have held up well with playground time, sports, and everyday use. They also look cute and match with a lot of outfits. The fit was true to size and the non-slip sole gives good traction.
Overall, these are a great affordable option for active kids and I would definitely buy them again!
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Reviewed in the United States on May 22, 2026
★★★★★ 5
10/10
Size: 12 Little Kid, Color: Black
Super cute! Great fit, breathable and durable material on the top of the shoe, super versatile with the solid neutral color, easy to clean, and great traction on the bottom of shoes!
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Reviewed in the United States on April 23, 2026
★★★★★ 5
Great shoes!
Size: 5 Big Kid, Color: Light Grass Green
This is my second time purchasing these shoes!
Not only are they stylish and well made, but they are comfortable! These have been used as running shoes, they have great support and suitable for long distances. The fit is true to size.
Thank you!
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Reviewed in the United States on April 16, 2026
★★★★★ 4
Shoe laces aren't great.
Size: 3 Big Kid, Color: Black White
I bought these RUNSIDE kids tennis shoes for everyday wear and school, and overall they’re lightweight, breathable, and comfortable for active use. My child liked how easy they were to put on, and they worked well for running and general play.
The shoes themselves feel flexible and pretty comfortable for the price point. The upper material is breathable, which helps during sports or warmer weather, and they don’t feel heavy on the feet.
However, the main issue is the original shoelaces. They constantly came untied no matter how they were tied, which became frustrating pretty quickly during the day. We ended up replacing them with better-quality laces, and that solved the problem.
Pros:
* Lightweight and comfortable for kids
* Breathable material works well for active use
* Easy for everyday wear and school
* Good fit for the price
Cons:
* Original shoelaces do not stay tied well
* Laces needed to be replaced for practical use
Overall, these are solid budget-friendly kids’ sneakers that work well once the laces are swapped out. The shoe itself is comfortable and functional, but the included laces are definitely a weak point.
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Reviewed in the United States on June 4, 2026