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Ships within 48 hours · Estimated delivery Oct 10 - Oct 15
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Description
alpinestars mtb helm Alpinestars SM3 Heat Helmet Large / Gloss Red/White/BlackAlpinestars SM3 HEAT Helmet Engineered for MX, Enduro, and off road riding, the SM3 Helmet integrates advanced technologies and innovations designed to enhance ease of use, comfort, and impact protection. Features: Advanced Shell Construction: This helmet features a thermo injected shell incorporating a special polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and
Alpinestars SM3 HEAT Helmet
Engineered for MX, Enduro, and off-road riding, the SM3 Helmet integrates advanced technologies and innovations designed to enhance ease of use, comfort, and impact protection.
- Ventilation: Maximized ventilation and high levels of heat transfer exchange thanks to 10 inlets and seven exhaust ports.
- Rotational Acceleration Force Protection: Alpinestars patented 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. This layer essentially acts as a slip plane to mimic the brain’s own low-friction cerebrospinal fluid, which is the body’s natural defense against oblique impacts.
- Visor Release: Patented 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.
- The inner and outer surfaces are engineered to minimize the effects of oblique impacts.
- 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.
- Soft textile chin strap is 25mm for optimal safety and rider comfort.
- Stainless steel D-rings ensure a tight and secure fit.
- The SM3 helmet conforms to both DOT certification and ECE 2206 homologation for use worldwide.
- 5 EPS inner parts with 4 densities to effectively manage volume and impact performance.
- Hydration tube channels are integrated into the helmet’s cheek pads for convenience and performance.
- Comfort liner is constructed using recycled materials for a lower carbon footprint.
- The fit can be tailored to the rider’s head thanks to the helmet’s crown and cheek pads, which are available as genuine spare parts in different thicknesses.
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
4.5 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
quality fabric and custom fit
Size: Large, Color: Cerise,orange,yellow,light Blue
excellent fit and fabric. This is my second order of this product
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Reviewed in the United States on February 25, 2026
★★★★★ 5
Good fitting support !
Size: Medium, Color: White
Just what the man needed. Very good contoured support. No jostling. Not a loose potato sack after an hour of wearing this. Highly recommended. Compare? Hanes, for example. Even the Jockey brand. Put those on, they're tight fitting, seemingly supportive. But they're not. They aren't contoured to fit. That's the whole idea. Contoured, to fit. And stay fitted. The trunk type, just like this wirarpa, and in half an hour it's loose loose loose fitting. A potato sack. No support. No support at all. That's not what a trunk brief is supposed to do. It's supposed to support, give comfort and confidence, stay in place feeling. Assuredness. And this wirarpa Mens Trunk does the job ! Wash and wear and wash and wear. Stays in shape, never gets stretched out and loose, for the fit.
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Reviewed in the United States on May 29, 2024
★★★★★ 5
Very Hard to Review. (But he gave it a 5????)
Size: Large, Color: White
This is more of a personal opinion I didn't wanna insult the vendor by rating it anything other than a five or four. Qualities is excellent. It's a very comfortable. It looks nice. The waist and height ratio is accurate and very good for the money value wise you get a decent amount of high-quality underwear. The best part is that it holds his shape and very comfortable.
I'll keep the simple I rated a five because it's high-quality material very good construction and I've used this namebrand in the past before but for their cotton so I know they build very quality products. However, the material for me is overly too soft. This isn't necessarily a bad thing its the type of material (I've had the same type in shirts). This is more personal.
When you're wearing the same material it's not noticeable because they blend in feeling wise the same.: however, this material type I've had in a T-shirt before. Very smooth very comfortable feels elegant but it becomes very noticeable on the skin that it's not the same material as the other clothing. Jeans/cotton etc
let's say you're wearing cotton shorts. It stands out almost like a different layer of clothing, which I don't like the feeling of not being able to blend in with the rest of the clothing. This isn't me strictly being picking anybody who's ever worn different type of materials, there's a double feeling to it that some people may find annoying. Of course, if everything you're wearing is the same type of material bamboo type it would blend in better. But for me, it just stood out too much being used on cotton or say board shorts. It feels like something you would use with the same material/silk or for sleeping, but even then it becomes noticeable with cotton sleep shorts.
I didn't return mine. I kept it, but I'm no longer using it.
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Reviewed in the United States on April 30, 2025
★★★★★ 5
My search is over
Size: Medium, Color: Black
Every few years I have to conduct an underwear search because my existing pairs are failing and the same make/model is no longer available. This year I tried several options until I found these. They are a good length, stopping at the upper thigh. They are comfortable and the elastic is tight enough to stay in place but not cut off my circulation.
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Reviewed in the United States on December 30, 2025
★★★★★ 3
Wirapa is a Bad Choice
Size: Large, Color: Black 01
Right size wrong fit ugh uncomfortable never buying these again i should have known better
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Reviewed in the United States on April 19, 2026
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