US Patent 7784218 Combination-cell foam floating island

A floating island comprising a combination-cell thermoplastic foam. In a preferred embodiment, the invention is a floating island comprising: an island body comprising at least a first portion that comprises a combination-cell thermoplastic foam and having a cavity; and a bedding material that is disposed in said cavity; wherein said combination-cell thermoplastic foam is buoyant in water and permeable to gas and water. In another embodiment, the invention is a floating island comprising: an island body comprising a first matrix layer, a second matrix layer and a third matrix layer; and a gas-trapping insert that is disposed between two of said layers.