Giro Aether Fit System
This is Giro's patented helmet fit and stabilizing system. The Giro fit system replacement part hugs the back of your head and reduces the tendency of your helmet to shift forward or backward. Unlike most systems, the fit system design provides adjustable tension that is independent of the helmet straps. What this means is that you don't have to over-tighten the straps to get a snug, comfortable fit.
- Genuine Giro Replacement Part.
NOTE: This fit system will ONLY fit the Giro Aether helmet.