MountainFLOW Waterproof Bike Grease is exactly as advertised, keeping water out of places it shouldn't be--like our bearings and headsets. Ideal for protecting these critical areas, we keep this grease close-at-hand in our home bike shops. Though we don't put too many globs on, a thin layer of grease a couple of times a year on bearings always does the trick and keeps them running smoothly for thousands of miles. Not to mention this grease is plant-based and completely biodegradable, helping us to minimize our impact on the trail systems we ride.