... heat preservation,sound insulation. float board,eva float board,swimming board1)Water durable: Closed-cell foam, non-water-absorbing, ... moisture-proof.2)Rot resistant: Seawater, oil, acid and alkali durable; antibacterial, safe, odorless and non-polluting.3 ... capabilities.6)Sound insulation: Closed-cell foam, good sound insulation capability. 7)Light weight float board