Precious Angel Standard Baby Crib & Toddler Bed Mattress delivers optimal ultra firm support and comfort your baby deserves thanks to its high-density thermo-bonded polyester core. Its construction is both lightweight and durable, promising to last for the years to come. To protect your mattress it comes with a non-removable cover that is made with 100% Vinyl. Whats more, it is waterproof and stain resistant to wipe clean within seconds. The Precious Angel Mattress is made without the use of flame retardant chemicals and has achieved GREENGUARD Gold certification, meeting the standard for low-chemical emissions for a sleep environment thats always safe and sound. Assembly required.