Call it what you like a key bumper, a key jacket or even a remote key fob protector.
If you're like me, your grip isn't the greatest. With electronic car keys being the norm, I was worried that I would end up breaking/cracking the key mechanism.
Fortunately, I found this offering for two key bumpers for only $7.99 on eBay. Our automotive dealer also sold them, but the cost was significantly higher.
Ironically, since I've started using it, I haven't dropped my keys once!