SKU: 28850366111

Troy Lee Designs - D4 Polyacrylite Fifty-50 MIPS Helmet (MTB)

Sale price$112.05 Regular price$124.50
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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18

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Description

Troy Lee Designs - D4 Polyacrylite Fifty-50 MIPS Helmet (MTB)Troy Lee Designs D4 Polyacrylite Fifty 50 MIPS Helmet (MTB) D4 Polyacrylite Fifty 50 MIPS Helmet is a Troy Lee Designs mountain bike helmet built for trail riders. The D4 platform is known for downhill focused coverage and a locked in feel when the terrain gets steep and fast. The Polyacrylite shell helps keep the price more approachable while still delivering the coverage riders expect. The Fifty 50 treatment gives this helmet a more individual feel

Troy Lee Designs - D4 Polyacrylite Fifty-50 MIPS Helmet (MTB)

D4 Polyacrylite Fifty-50 MIPS Helmet is a Troy Lee Designs mountain bike helmet built for trail riders. The D4 platform is known for downhill-focused coverage and a locked-in feel when the terrain gets steep and fast. The Polyacrylite shell helps keep the price more approachable while still delivering the coverage riders expect. The Fifty-50 treatment gives this helmet a more individual feel than a plain solid option. The MIPS-equipped build adds another layer of confidence for riders who prioritize modern helmet technology.

The fit is aimed at riders who need their MTB helmet to stay composed on technical descents while still feeling comfortable during transitions, climbs, and longer days outside.

Why We Like It: it balances mountain bike protection with the kind of ventilation and fit that keeps longer rides from feeling like work.

Why It’ll Work for You: This is a strong pick when you want a mountain bike helmet that feels at home on everything from rough local descents to destination riding.

Variants / Options: multiple sizes and colorways available; check the selector for current stock.

Key Features:
  • The reigning king of full-face helmets, the D4 range expands with a Polyacrylite model packing the same safety and comfort features as the premium carbon and composite models into a price-conscious shell. Details make the D4 the most coveted full-face in mountain biking, including Mips® C2 brain protection, an air intake system for ventilation, and an unmatched anatomical fit.
  • Mips® C2 Rotational Impact Brain Protection System
  • Advanced Polyacrylite shell construction
  • Front air intake system, with high flow through polymer center and power grid side mesh
  • Collarbone Suspension System
  • Breakaway visor screws
  • Anti-microbial padding
  • Quick release contoured 3D cheek pads for anatomically optimized fit

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 28850366111

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Carly Perez
Chelsea, US
★★★★★ 5
Toddler approved
Size: 8 Toddler, Color: Black
My kid loves these shoes. We’ve bought them multiple times. She can get them on and off easily and they stand up to her wild adventures.
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Reviewed in the United States on May 3, 2026
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Allyssa
Lake Worth, US
★★★★★ 5
So cute and so worth it!
Size: 3 Little Kid, Color: Turquoise
AMAZING for my 7 year old daughter. She can tie shoes but I no longer have to wait on her to do so. It takes 2 seconds for her to put these on and she says that they are super comfortable. We have been to Silver dollar City multiple times and she never complains about her feet hurting! They are easily washed in the washer. They hold up great. I think they are very much worth the money! Fit normal.
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Reviewed in the United States on December 8, 2025
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Morgan
Cuba, US
★★★★★ 4
Our everyday shoe!
Size: 13 Little Kid, Color: Turquoise
Great shoes and good fit. Fits as expected. The sole has worn down a bit quicker than I had hoped but my kiddo wears them everyday. I would buy them again for sure!
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Reviewed in the United States on November 30, 2025
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lisa shelko
Houston, US
★★★★★ 5
So comfy !
Size: 2 Little Kid, Color: Lavender
Shoes are so comfy and stable . I love em !
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Reviewed in the United States on May 20, 2026
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Nadezhda
Pawtucket, US
★★★★★ 5
So cute and comfy for my little one!
Size: 11 Little Kid, Color: Black
Bought these for my 4 year old daughter and we both love them. She wants to wear them every single day! They fit true to size and look adorable. Great quality for the price.​​​​​​​​​​​​​​​​
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Reviewed in the United States on April 30, 2026

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