Troy Lee Design D4 Composite Helmet Shadow Black color-bright-gold The birdcage design increases the

The birdcage design increases the rigidity

Thickest point is 1

Diameter: 451 (20”)

Internal pocket inside the waistband

Troy Lee Design D4 Composite Helmet Shadow Black color-bright-gold The birdcage design increases theTroy Lee Design D4 Composite Helmet Shadow Black 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