This is a good sign – it means your mattress conforms to all UK Fire Regulations. You may notice that the surface of your mattress feels damp when it is unpacked. We are required to treat certain mattress fabrics with a harmless Fire Retardant at the source, in order to comply with the Regulations. This material is salt based, which will absorb moisture. When weather conditions are humid, or there is a lot of rain, this effect will be exaggerated, and when the mattress is packed into a bag, condensation may form, causing a damp feeling on the mattress. The feeling of damp will disappear quickly and should not materialise again unless your mattress is kept in a particularly humid room.