The Babywise Crib Mattress is a comfortable, safe & supportive mattress for your baby. Product Features Made from CMHR 25 density foam Breathable polyester tricot mesh cover helps air to circulate as well as allowing liquids to drain Zip ensures that the cover can be removed for washing Made without any antimony, phospherous, arsenic, barium, lead Safety: BS 1877 Part 10 for safety & performance. BS 7177 for flammability Thickness: 4cm