【No Seams - Fits all 54 "x29.5" cribs】We use hand sewing techniques to provide a tight fit to the crib every time. No risk of unsafe space or losing pacifiers, toys on either side or corner of this crib. 【Support】Made of soft and strong high grade foam. It has good support and stability when baby rolls over to avoid the risk of physical injury and suffocation. 【Quiet and odorless】The surface of the crib mattress is made of high-grade velvet. The toddler mattress is very quiet and does not emit a pungent smell. 【Convenient】Cut open the bag with scissors (Note: Do not cut to the mattress). 72 hours, the mattress will quickly recover to 90%-95%.Leave it for 3-5 days for normal use. 【Service】We stand by our commitment to quality and have incredible customer support. We care about you and your children, so if you have any questions, please feel free to contact us.