FLY Racing’s HDM (High-Density Memory) protectors are made of a special blend of viscoelastic foam with memory function allowing for repeat impacts.
Fly Racing Cypher MTB Knee Guards
![](https://motorbikegears.com/wp-content/uploads/2023/02/Fly-Racing-Cypher-MTB-Knee-Guards.png)
FLY Racing’s HDM (High-Density Memory) protectors are made of a special blend of viscoelastic foam with memory function allowing for repeat impacts.