The Sopora Delux is a modern luxury crib mattress with a practical edge. Offering all the features of the Sopora Ultimate, the Delux only differs on the toddler sleep side. The Delux is a 6" deep, all foam mattress with dual sleep surfaces. Made with CertiPUR-US® and GREENGUARD® Children and Schools certified foam. The Delux is engineered to withstand wear and provide an even ergonomic support for the full span of your baby's crib mattress use. For infants, use the ultra-firm, high-density foam side. As your child grows flip the mattress to the SupportSoft high-density foam toddler side. SupportSoft provides a layer of foam, which is plush in feel and luxurious. The enhanced airflow of this foam creates better air circulation at the surface of the mattress. SupportSoft foam has a high level of resilience (bounce back) and high level of durability. The Delux offers BabySafe side seams, which are welded with ultra-sonic sound waves to keep wetness out, allowing the inside of the mattress to stay clean. BabySafe seams are dropped to the sides of the mattress creating a seamless waterproof edge with no decorative cording or holes on the surface. This eliminates entry points for allergens, bed bugs, and fluid leakage. The Delux offers square corners and edges to fit tightly into the crib, with no rounded corners or surface designs that can trap dirt or dust mites. The rectangular shape of the mattress, the same shape as the crib, holds sheets tight to keep baby safe. The Delux's medical grade, baby soft, stretch-knit mattress cover is compliant with all current safety standards. Its lightweight and pliable nature enables the baby's body to conform to the surface while allowing the inner construction to provide comfort and ergonomic support for which it was designed. The cover is vinyl, PVC, lead and phthalates free.