Reconstituted foam core to absorb impact. Ideal for use in Secondary and High Schools in general PE and Gymnastic activities. Must be stored flat. British Standard BS 1892-3:2003 for flammability. All feature Blue PVC flame retardant covers, long-life heat welded corners and a non-slip latex base. The anti-slip surface of the mats needs to be cleaned periodically to maintain their efficiency. The upper surface (PVC) needs a wipe over with a mild cleaning solution as required. Tears should be repaired at once.