D4 Polyacrylite Helmet W/MIPS Linear Blue YOUTH FLOWLINE LONG SLEEVE JERSEY Index and thumb are touch

Index and thumb are touch screen compatible

3 sizes and colors available

Replace and refresh your Troy Lee Designs helmet with the SE4 liner replacement

The Flowline Helmet features a combination of comfort

D4 Polyacrylite Helmet W/MIPS Linear Blue YOUTH FLOWLINE LONG SLEEVE JERSEY Index and thumb are touchThe 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.