Motorcycle & Scooter Covers

Motorcycle & Scooter covers generally fall in one of three groups:

Lightweight travel covers pack extremely compact, may have some level of water resistance, and are mostly used to protect a motorcycle from UV light, tree saps, and other debris.
Full protective covers have much heavier construction, are usually too bulky for travel, are 100% waterproof/vented, and will protect the entire bike from the elements or prying eyes. These are best for every day / all day use.
Indoor or dust covers have no waterproofing, but therefore have no condensation issues either.

Lifetime Warranty. Many heavy duty covers come with a manufacturers Limited Lifetime Warranty. Keep in mind that deterioration from harsh elements is usually not covered. But think about the harm prevented to your bike, when the cover eventually fails.