POLISPORT MX Bullit Handguards Bicycle FLY Racing’s HDM (High Density FLY Racing’s HDM (High Density Memory) protectors are made of a special blend viscoelastic foam with memory function allowing for repeat impacts that passes CE EN1621 1 rating to level 1 Expanded volume EPS means strategic areas of the helmet have more impact absorbing EPS the new model on Polisport’s new handguard generation to the handlebar