stand out on the podium

Always Evolving.

D4 reigns king atop downhill podiums and BMX events across the globe. Available in carbon, composite and polyacrylite. Details are what makes the D4 the most coveted full-face in mountain biking.

Prioritizing safety while balancing weight through premium construction and materials, D4 incorporates Mips® protection with an EPP chin bar and anatomical cheek pads with emergency release.

  • Mips® C2 Rotational Impact Brain Protection System

    The ultimate protection for your head.

  • LIGHTWEIGHT

    From 1000g to 1150g, you won't notice you're wearing it.

  • MAXIMUM VENTILATION

    With 20 high-flow intake and exhaust ports, you will stay cool and composed.

Always Evolving.
Always Evolving.
Always Evolving.
stand out on the podium

Always Evolving

D4 reigns king atop downhill podiums and BMX events across the globe. Available in carbon, composite and polyacrylite. Details are what makes the D4 the most coveted full-face in mountain biking.

Prioritizing safety while balancing weight through premium construction and materials, D4 incorporates Mips® protection with an EPP chin bar and anatomical cheek pads with emergency release.

  • Mips® C2 Rotational Impact Brain Protection System

    The ultimate protection for your head.

  • LIGHTWEIGHT

    From 1000g to 1150g, you won't notice you're wearing it.

  • MAXIMUM VENTILATION

    With 20 high-flow intake and exhaust ports, you will stay cool and composed.

Always Evolving
Always Evolving
Always Evolving

D4 CARBON

1 6

D4 COMPOSITE

1 12

D4 POLYACRYLITE

1 11

FEATURES & TECH

Mips®

Mips® C2 brain protection system-protects against rotational impacts.

Weight:

CARBON 1000g | COMPOSITE 1050g | POLY 1150g

X-STATIC & XT2

X-STATIC & XT2 Anti-Microbial quick release contoured 3D cheek pads create an anatomically optimized fit. Separately placed precision fit headliner with 7 anchor points gives you an optimal fit.

VENTILATION

Front air intake system with high flow-through polymer center grille and power grid side mesh. 24 total vents: 11 front intake ports 6 overhead intake vents that channel air on top of your head and an industry leading 7 rear exhaust ports.

EPP COLLARBONE IMPACT SYSTEM

A relief area that reduces the forces in the center lower section of the helmet where shoulder/collarbone impacts have been known to occur.

EPS HEAD FORM

Added EPS and new head form shape for improved impact performance in critical areas

INCREMENTAL SIZING

3 helmet shell sizes and padding options for full incremental sizing for greater range of fitment

Size Chart

Measuring your head with a fabric tape measure around the circumference of your head holding the tape just above your eyebrows and ears. 1” = 25mm

Size XS SM MD LG XL XXL
HAT SIZE 6 5/8 - 7 6 7/8 - 7 7 1/8 - 7 1/4 7 1/4 - 7 3/8 7 1/2 - 7 5/8 7 3/4 - 7 7/8
CM 53 - 54 55 - 56 57 - 58 58 - 59 60 - 61 62 - 63
IN 20 7/8 - 21 1/4 21 5/8 - 22 22 3/8 - 22 3/4 22 3/4 - 23 1/4 23 5/8 - 23 1/4 24 3/8 - 24 3/4

Compare D4 Helmet Lineup

Most Popular

D4 Carbon

D4 Composite

D4 Poly
WEIGHT 1000g 1050g 1150g
SHELL MATERIAL Carbon Shell Composite Shell Polyacrylite Shell
SHELL SIZES 3 helmet shell sizes and padding options for full incremental sizing for greater range of fitment 3 helmet shell sizes and padding options for full incremental sizing for greater range of fitment 3 helmet shell sizes and padding options for full incremental sizing for greater range of fitment
ROTATIONAL DEVICE Mips® C2 brain protection system-protects against rotational impacts. Mips® C2 brain protection system-protects against rotational impacts. Mips® C2 brain protection system-protects against rotational impacts.
IMPACT LINER EPP Collarbone Impact System & EPS Head Form EPP Collarbone Impact System & EPS Head Form EPP Collarbone Impact System & EPS Head Form
COMFORT LINER Removable snap-in, washable comfort liner with moisture-wicking materials Removable snap-in, washable comfort liner with moisture-wicking materials Removable snap-in, washable comfort liner with moisture-wicking materials
VISOR SCREWS Smart sheer breakaway visor screws Smart sheer breakaway visor screws Smart sheer breakaway visor screws
NUMBER OF VISORS 1 1 1
CERTIFICATIONS CPSC 1203, CE EN1078, ASTM F1952-DH, ASTM 2032-BMX CPSC 1203, CE EN1078, ASTM F1952-DH, ASTM 2032-BMX CPSC 1203, CE EN1078, ASTM F1952-DH, ASTM 2032-BMX
VENTILATION 24 total vents (11 front intake, 6 overhead intake & 7 rear exhaust ports) 24 total vents (11 front intake, 6 overhead intake & 7 rear exhaust ports) 24 total vents (11 front intake, 6 overhead intake & 7 rear exhaust ports)