Troy Lee Designs D4 Polyacrylite Shadow 2026 MIPS Adult MTB Helmets Harley-Davidson Fat Bob FXDF 2016 Parts Advanced Rotational Energy Manage-ment

Advanced Rotational Energy Manage-ment

With a carbon aramid fiber shell designed with technologies developed for MotoGP riders

situated in the ear area of the helmet

Convenient Side Pockets: Functional side leg pockets securely hold your phone

Troy Lee Designs D4 Polyacrylite Shadow 2026 MIPS Adult MTB Helmets Harley-Davidson Fat Bob FXDF 2016 Parts Advanced Rotational Energy Manage-mentTroy Lee Designs D4 Polyacrylite Shadow 2026 MIPS Adult MTB Helmets 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