Sealy Baby Ultra Rest Mattress has all around border rods that keep the sides, corners and edges firm just like an adult mattress. The steel vertical support bars distribute baby"s weight evenly over the entire surface of the mattress. This comes with 204 heavy gauge interlocking steel coils that are heat tempered for strength and durability. This comes with two non allergenic layers provide long lasting durability and support, while a third non allergenic layer provides comfort for a plush, gentle sleeping surface for your baby. This comes mattress with 15 year warranty on workmanship and materials.