Create the ultimate sanctuary for your little one with the Serta Perfect Balance 4-inch Mini Crib Mattress. Designed to fit most mini or portable cribs, this baby mattress delivers all the benefits of a full-sized crib mattress in a scaled-down size. Featuring a fiber core that's made from recycled materials, it provides a comfortable, safe and hypoallergenic surface that helps babies get the rejuvenating sleep they need in order to grow and develop. The waterproof, vinyl cover blocks wetness to aid in preventing mold, mildew and odor, and is easy to clean, just wipe clean with warm water and mild soap. And that's not all, the Serta Perfect Balance 4-Inch Mini Crib Mattress is extremely lightweight which makes changing the sheets or flipping the mattress a cinch. Fits most mini and portable cribs (not designed for standard cribs or pack 'n plays).