D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet
D4 Polyacrylite MIPS Helmet

Troy Lee Designs

D4 Polyacrylite MIPS Helmet

Sale price$385.00
SKU: 174499002
Only 1 unit left
Color:Shadow Black
Size:SM
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Parts, apparel, and accessories

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Complete Bikes

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Wheels & Wheelsets

Free Wheel Pro Pack Shipping

AK, HI, U.S. Territories & International

Shipping rates calculated at checkout

For complete details, including exclusions and shipping destinations, visit our Shipping Information page.

Free Shipping $50+

Parts, apparel, and accessories

Free shipping on orders over $50 within the lower 48

Complete Bikes

Free Pro Pack Shipping on bikes over $3,500

Wheels & Wheelsets

Free Wheel Pro Pack Shipping

AK, HI, U.S. Territories & International

Shipping rates calculated at checkout

For complete details, including exclusions and shipping destinations, visit our Shipping Information page.

Earn Rewards

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Earn While You Shop

Earn points on qualifying purchases online and in-store

Redeem for Future Savings

Use your points toward future gear, upgrades, and trail essentials

Unlock Higher Reward Tiers

Spend more and earn points faster with Bronze, Silver, and Gold status

For complete program details, earning rates, and redemption information, visit our Rewards page.

Earn Rewards

Every ride deserves a little extra. With Fanatik Rewards, you'll earn points on qualifying purchases and redeem them for savings on future orders. It's our way of saying thanks for choosing Fanatik.

Join for Free

Create a Fanatik account and you're automatically enrolled

Earn While You Shop

Earn points on qualifying purchases online and in-store

Redeem for Future Savings

Use your points toward future gear, upgrades, and trail essentials

Unlock Higher Reward Tiers

Spend more and earn points faster with Bronze, Silver, and Gold status

For complete program details, earning rates, and redemption information, visit our Rewards page.

45-day Returns

We want you to be happy with your purchase. Most new and unused products can be returned within 45 days of purchase for a refund.

Eligible Returns
  • Most new and unused products
  • Original packaging and accessories included
  • Return requested within 45 days
Exclusions Apply
  • Final Sale and Outlet products
  • Custom-built bikes and wheel builds
  • Used products
  • International orders


For complete return details and instructions, visit our Returns page.

45-day Returns

We want you to be happy with your purchase. Most new and unused products can be returned within 45 days of purchase for a refund.

Eligible Returns
  • Most new and unused products
  • Original packaging and accessories included
  • Return requested within 45 days
Exclusions Apply
  • Final Sale and Outlet products
  • Custom-built bikes and wheel builds
  • Used products
  • International orders


For complete return details and instructions, visit our Returns page.

Price Match

Shop with confidence knowing you're getting a competitive price. If you find the exact same product advertised for less by another authorized U.S. retailer, submit a price match request and we'll review it.

Price Match
  • Identical product must be in stock and available for purchase
  • Competitor must be a U.S. based retailer
  • Product details and advertised price must be verifiable
Price Protection
  • If we lower our price within 30 days of your purchase, you may be eligible for Fanatik store credit
  • The same model, size, and color must be in stock at the lower price

For complete eligibility requirements and exclusions, visit our Price Match & Protection page.

Price Match

Shop with confidence knowing you're getting a competitive price. If you find the exact same product advertised for less by another authorized U.S. retailer, submit a price match request and we'll review it.

Price Match
  • Identical product must be in stock and available for purchase
  • Competitor must be a U.S. based retailer
  • Product details and advertised price must be verifiable
Price Protection
  • If we lower our price within 30 days of your purchase, you may be eligible for Fanatik store credit
  • The same model, size, and color must be in stock at the lower price

For complete eligibility requirements and exclusions, visit our Price Match & Protection page.

Sizing Chart

D4 Polyacrylite MIPS Helmet

Size XS SM MD LG XL XXL
Head Circumference 53 - 54 cm 55 - 56 cm 57 - 58 cm 58 - 59 cm 60 - 61 cm 62 - 63 cm

Sizing Chart

D4 Polyacrylite MIPS Helmet

Size XS SM MD LG XL XXL
Head Circumference 53 - 54 cm 55 - 56 cm 57 - 58 cm 58 - 59 cm 60 - 61 cm 62 - 63 cm

Highlights

  • Mips® C2 Rotational Impact Brain Protection System
  • Collarbone Suspension System
  • Breakaway visor screws
  • Anti-microbial padding
  • Quick release contoured 3D cheek pads for anatomically optimized fit

Description

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.