● Dual-sided Sleeper Firm/Soft Support: This playpen mattress features unique reversible-sided design with different levels of firmness on each side for various growth stages. The firm high density foam provides more support for 0-9 months newborns and protects their spine. While the softer, high-resiliency memory foam side is comfortable for toddlers over 9 months to use.● 3'' Think Comfortable and Breathable Foam: Made of 3" high-quality skin-friendly 40D memory foam, this baby mattress can provide strong support to baby's vertebra and help newborns get maximum comfort. Designed with air bleed, the mattress topper can also discharge air, reduce body heat and then keep a balance between firm support and soft comfort.● Fit Most standard Bed: We have carefully designed rounded corners and superior edge support in order to create a snug fit. In this way, this 38'' x 26'' baby crib mattress can fit most standard full-size crib and toddler bed. It provides newborns with totally safe spaces. And there is no gap between two packs, no risk of unsafe spaces. Please measure your crib first to ensure a perfect fit.● Tri-Fold Design for Easy Carrying: Tri-fold design allows you to easily fold up your mattress into this carrying bag, which is convenient for you to use, store and travel with. The compact size doesn't take up too much space, so you can store it in any ideal corner.● Washable Zipped Cover and Safe to Use: The cover of this mattress is removable, simplifying the cleaning process and helping to maintain the original condition of memory foam. You can easily wash it in the washing machine to keep your kid's sleep environment fresh, clean, and cozy. Meets CPSC/ASTM certification and the foam is free of lead, phthalates for baby’s safety.