Mattress cover: sleep safety multifunctional fabric, quilted with wash fleece, special air-permeable ventilation fabric on the sides, separable, washable at 60°C. Mattress core: Baby side with 3D air cushion layer for unique air circulation, combined with comfort pads made of open-cell Cellflex foam, ventilated safety edges. 3D air cushion support for premium comfort. Three-dimensional air cushion pads are incomparably breathable and ensure unhindered breathing, even when babies sleep in a prone position. The honeycomb mattresses consist of individual, sturdy polyester threads that gently rock your baby to sleep while offering the highest level of resilient comfort.