King Starlite, also referred to as King Starboard XL, is a lighter weight cousin of King Starboard. The base material is identical, however King Starlite is extruded with a blowing agent added that allows the material to hold air. As a result, King Starboard XL is about 30% lighter weight and considerably less expensive than Starboard. The trade-off is that King Starlite has a cellular edge that can collect dirt and be very difficult to clean. King Starlite is a great alternative if you need a piece of material for a project where the material will be hidden (substrate, mounting plate, etc.) or when aesthetics are not a priority over price.