This firm and breathable mattress ensures that air can circulate and overheating is avoided.Type: Compatible with Stokke Sleepi Mini Bed (sold separately). Support level: Firm.Other features: The mattress is made with multiple layers of breathable 3D mesh with a Sorona® Bicomponent Stretch fiber core to offer firmness and maximal airflow. Both the core and cover can be easily removed for washing. Cover and core are removable; cover is machine washable Polyester/Sorona elasterell-p Imported OEKO-TEX®-certified materials free of harmful substances