Special foam core is hospital density providing extra firm support with an additional layer of    memory foam that is designed to relieve join pain.
Tuff tech nylon cover is antibacterial treated to prevent the growth of odor causing
   bacteria. Cover contains no PVC's.
Dust mite proof construction.
Square corner construction ensures no gaps between the crib and mattress for a safer,  
   snugger fit, and edge to edge security.