About the Proguard:
Whisper it, but mudguards are no longer un-cool. It's tough to go fast when you've got mud in your eye, and no one likes a wet backside. That's where RRP's Proguard comes in.
This rear version attaches to the seat stays of virtually any mountain bike and provides some protection from water and mud. More than that it helps keep the crud away from your precious rear shock and dropper seatpost. What's not to like?
Note: Image show standard and max sizes for comparison