This Junior foam mattress is made with Combustion Modified High Resilience Foam to comply with Government Regulations of Ignition & comes with all the relevant BS standards! It is free from antimony, phosphorous or arsenic fire retardant chemicals. Always ensure a good close fit of the mattress in the cot. Air all bedding, in particular the mattress, as frequently as possible. Mattresses are breathe through. The cover is fully overlocked & is made from corovin fabric. Also the cover can easily be removed for washing by means of the zip. Hand wash or gentle machine wash (maximum 60 degrees) in a mild detergent & rinse thoroughly. It is recommended that you turn your mattress frequently.