This firm and breathable mattress ensures that air can circulate and overheating is avoided so baby can sleep comfortably.Type: Compatible with Stokke Sleepi Bed (sold separately). Support level: Firm.What it does: The mattress cover features multiple layers of breathable 3D mesh surrounding a core made of highly breathable filaments, crafted with BREATHAIR® technology. This design allows your baby to sleep comfortable and safely. A breathable mattress ensures air can circulate and remove carbon dioxide exhaled by your baby, it also prevents overheating. This is crucial when little ones turn onto their stomachs while sleeping.Additional features: The core of the mattress can be easily rinsed and dries quickly due to its water-repellent material. Sizing information: 5.5 lb.; 27.5" x 3.3" x 53.7". 3D mesh layers on mattress cover for airflow Cover and core are removable; cover is machine washable Cover: 100% polyester; fill: 60% polyester, 40% elasterell-P Imported