This mattress ships compressed in a lightweight, easy-to-carry box for ultimate convenience; For optimal performance, unroll your mattress within two weeks of purchase to allow for proper expansion in a room temperature setting. This mattress’ soft outer cover is water-resistant, removable and hand-washable; Gently unzip the outer cover, hand wash in cold water with mild soap (no bleach), and line dry to keep your child’s sleep environment fresh, clean, and cozy. Ideal mattress firmness for your child’s comfort and safety; Mattress made of high-quality, breathable foam to maximize air flow. This mattress is GREENGUARD Gold certified, free of prohibited phthalates, lead, and mercury, and meets all applicable federal flammability standards; This mattress is backed by a 6-year limited warranty. This mattress is designed to fit any standard full-size crib and toddler bed; length (132.08 cm) x width (70.1 cm) x height (up to 12.7 cm); weight (3.18 kg); Mattress made of polyurethane foam. Fabric Care Instructions: Spot Clean Only Mattress ships compressed in a small, lightweight and easy to carry box, once mattress is removed from box and unpackaged, it will start to self-expand before your eyes Please allow at least 72 hours for mattress to expand to its full size (actual expansion time may vary) Show More