Replacement Sheet & Thicker Mattress You will get a free sheet for replacement. which material is cotton. We also increased the thickness of the mattress to ensure maximum comfort. Removable Hanging Toy A removable hanging plush toys toentertain baby, while stimulating early visual development. Breathable & Visible Mesh Design Designed with mesh provides a well-ventilated and bright sleeping space. You can observe your baby's status at any time, with peace of mind and care. Second Layer for Storage When used as a baby bassinet, you can store baby supplies on the second level for easy access. Side Storage Bag The large pocket on the side can also store baby clothing and supplies. Side Drop The side rails can be adjusted to three different heights to meet different needs