Troy Lee Designs D4 Composite Full Face Helmet (Stealth Black) (2XL) (w/ MIPS)

Troy Lee Designs D4 Composite Full Face Helmet (Stealth Black) (2XL)
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Price: $399.99

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Troy Lee Designs D4 Composite Full Face Mountain Bike Helmet Description:

The Troy Lee Designs D4 Composite Full Face Mountain Bike Helmet protects the head with next-level crash safety features and weight saving technology in a sleek package that looks and feels great. Built throughout the shell of the Troy Lee Designs D4 is a series of strategically placed vents that help to release built up heat and moisture with a focused front air intake system that channels high air flow through a polymer chin bar center and power grid side mesh. Safety and comfort are combined inside the shell of the D4 Helmet thanks to the anatomic 3D cheek pad set that fits snug without being too constrictive, and the collarbone suspension system that relieves impact to the body at the base of the helmet in the instance of a crash. 


  • Thoughtfully crafted full-face helmet with advanced safety and ventilation
  • MIPS C2 Rotational Impact system increases protection from unique momentum influenced collisions
  • Composite shell provides adequate safety and excellent weight savings
  • Breakaway visor screws spare damage to helmet and visor from crash damage
  • Unique front air intake system in chin bar comprised of polymer center and mesh sides supply high air flow
  • Includes Troy Lee Designs drawstring helmet sock


  • Shell Material: Fiberglass Composite
  • Fit System: Chin Strap w/ D-ring Closure
  • Chin Bar: Fixed
  • Safety Features: MIPS
  • Certification: CPSC, ASTM F1952 (DH), ASTM F2032 (BMX)
  • Color: Black
  • Weight: 1050g (Size:M)

This product was added to our catalog on March 11, 2024

Helmet Measurements:

  • Measure circumference of head using fabric tape measure
  • Measurement should be taken just above eyebrows and ears: Approximately 1" (25mm)
D3Hat SizeCircumference (in)Circumference (cm)
XS6 5/8 - 6 3/4"20 7/8 - 21 1/4"53 - 54cm
S6 7/8 - 7"21 5/8 - 22"55 - 56cm
M7 1/8 - 7 1/4"22 3/8 - 22 3/4"57 - 58cm
L7 1/4 - 7 3/8"22 3/4 - 23 1/4"58 - 59cm
XL7 1/2 - 7 5/8"23 5/8 - 24"60 - 61cm
2XL7 3/4 - 7 7/8"24 3/8 - 24 3/4"62 - 63cm

Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired.