Sweet dreams begin with the perfect baby crib mattress, which is why we've created the Safety 1st Sweet Dreams Baby Crib & Toddler Bed Mattress. It is made with a high-density thermo-bonded polyester fiber core that offers ample ultra firm support for your little one. This lightweight and durable mattress is then wrapped with a 100% vinyl outer cover that is waterproof and stain resistant to wipe clean in an instant. The waterproof crib mattress fits standard cribs and toddler beds with internal measurement of 28 in. X 53 in. Made without the use of flame retardant chemicals, PVC, lead or phthalates and has achieved GREENGUARD Gold certification, meeting the standard for low-chemical emissions for a sleep environment that's always safe and sound. Assembled in Canada, this Safety 1st mattress comes with a 10-year limited warranty. Perfect for a night of sweet dreams! Safety 1st Sweet Dreams 5" Crib & Toddler Mattress with Waterproof Cover| Greenguard Gold Certified Waterproof 100% vinyl cover locks out spills and can be easily wiped clean Non-removable outer cover is stain and tear resistant for long-term use High density polyester fiber core is breathable and maximizes airflow Lightweight to easily change baby's sheets or rotate the mattress without any heavy lifting Ultra firm recommended crib mattress firmness to provide infants with optimal support and a safe sleep Designed to fit standard size cribs and toddler beds; dimensions: 52"L x 27.5"W x 5"H. Weight limit: 50 lb Greenguard Gold certified and assembled in Canada Non-toxic and free of harmful chemicals, PVC, lead and phthalates Rounded square corners for edge-to-edge support and a snug fit Backed by a trusted 10 year limited warranty