Dirt and dust can penetrate the outer layer of a hoverboard and potentially cause internal damage. Most self balancing scooters are also very prone to dents and scratches. A well made skin can mitigate these problems and extend the life of your hoverboard.
Many hoverboards aren't water resistant out of the box. While a hoverboard skin doesn't fully waterproof a hoverboard, it will minimize the impact of some contact with water.
There are hundreds of different color combinations and designs available on hoverboard skins. If you want to stand out from the crowd a hoveboard skin is a must have.