Contains spillages and allows fuels and oils to be absorbed into the base, whilst allowing clean water to escape via the side walls.The internal base has a non-permeable layer between the retained liquid and the ground, rapidly absorbing oils and fuels.Optional liners offer the same features as the internal base but can be removed.The crush resistant memory foam side walls return to the original shape after heavy plant and machinery are rolled across.Supplied ready to use.High puncture resistance.Fire retardant.UV resistant.Reusable for long life.