SKU: 28850366111

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

$112.05 $124.50
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Ships within 48 hours · Estimated delivery Jul 31 - Aug 5

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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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4.5 ★★★★★
Based on 19 reviews
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B
Verified Purchase
Brenda W
Cuba, US
★★★★★ 3
Great idea but didn't hold up!
Size: Large
My dog and I really enjoyed this as a tug toy to use where it kept my hands away from accidental nips. When we initially got it we let her play solo with it after our tug session and I noticed that she left little teeth puncture holes so we packed it away for awhile and exclusively used the other new toy we bought for her. After a few weeks we took this back out and, again, we loved it and this time I allowed her to play with it longer and although it was showing a lot of the little tooth marks it seemed to be holding up so I left it out with her. None seemed deep, just seemed like impressions from her teeth. We continued to enjoy it for about a week where she'd carry it over to us for tug sessions, loop it on our feet when we were sitting watching tv and chewing on it a bit. I'd look at it when we'd tug and, like I said above, it seemed to be holding up. After one session of tug when she took it off to chew on and I was watching some tv I checked on her after awhile and she had bitten through the black side and had chewed up into small pieces about a two inch section of it. Small, little hard bits were in a pile on the floor. She didn't just bite through, it had broken into small, little pieces and hopefully I was able to get all of them and she didn't swallow any! So if you want to get this exclusively as just a tug toy and not something for your dog to chew on and plan on putting it away after I think it will be okay for that and should last but if your dog is a serious chewer like ours is you may not want them to be allowed to chew on this. Seemed like it was going to last and then suddenly I was throwing away half of it and hoping she didn't eat any of the black bits. We still have the yellow side and will take that out for some tugging but no longer for her to play with freely!! She did tremendously love running around with this thing and would flip up the loose end and hook it on her face or our feet and was so cute to watch her!! Wish it had lasted!!
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Reviewed in the United States on May 9, 2013
S
Verified Purchase
Sean
Charlottesville, US
★★★★★ 5
Name holds true.
Size: Large Triple
Just bought my second set of these.. first set lasted my healer almost 4 years and are still together but starting to split at the smaller seams so you can’t play as aggressive as my dog would like. We bought the second set and now she has her second wind! She loves tugging and I love knowing this toy will last a good while especially with an active dog!
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Reviewed in the United States on January 4, 2025
K
Verified Purchase
Kelsey
Pawtucket, US
★★★★★ 5
The dogs like it very much, it produces a lot of noise.
Size: Large, Size: Large
I’m rating this based on my dogs’ response to this toy – they absolutely love it, and it has seen more use without damage than any of their regular throwing toys. At the same time, unless you enjoy, REALLY ENJOY the sound of crunching water bottles, you may not like having this ball in the house. Pros: The rubber outer shell of the ball is durable, and can survive both chewing and pulling forces (as a note, my dogs do not concentrate on chewing - they use it more for play games). It’s big enough for my dogs to play tug of war with it, hooking their teeth in the mesh, and they since it bounces around if they drop or kick it, it makes the game more interesting than rope. They did crush the interior plastic, but they don't really seem to care. It’s much more engaging than a normal ball, and can be modified to hold treats, sticks, rope elements and other external bits, which my shepherd mix loves; he gets bored easily and frequently, and this can actually entertain him. Cons: This toy is loud, and produces repetitive crunching sounds. It is apparently really engaging to chew, and my dogs will produce the horrid plastic crackling up to half an hour at a time. If you let your dogs in and out, it would make a fine outdoor toy, but since I have a dog door, it migrates around to pretty much wherever the dogs are. I kind of hate it, but will probably buy another if they break this one since they enjoy it so much.
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Reviewed in the United States on October 17, 2016
B
Verified Purchase
BakedN
Omaha, US
★★★★★ 5
Very durable and my Heeler's fave inside toy
Size: Large
My red Heeler loves these balls, second only to Tennis balls but she destroys those within minutes and they are outside only. This is her inside ball. She is hard on toys and has the strongest bite of any dog I've had (shepherds, collies, weimaraners, retrievers, Labs) yet these continue to last. She catches the ball, we play tug of war with it (she places it in hand hand and pulls only when I have a firm grip, she shakes it and flings it. The rubber outside even outlasts the water-bottle like plastic piece inside. Steps holds the ball with her foot and pulls on the rubber with her mouth, stretching it to sometimes twice its size. I pull while shes pulling. This thing gets abused daily and keeps on going. Its the most used toy and she brings it to me to play with every day. Each ball lasts about 6 months before the inside ball is toast and the outer rubber is finally starting to tear/break. which for me in an incredibly long time. If this ball is available to play, she wants it over all others. Shes NEVER gotten a piece off to actually swallow and that alone is worth the price.
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Reviewed in the United States on June 4, 2025
D
Verified Purchase
David Fulford
Bozeman, US
★★★★★ 4
Good for price
Size: Medium
Good product, wish it was a little more chew resistant
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Reviewed in the United States on April 29, 2026

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