It is a soft mattress designed by Maria Montessori, which allows the baby to feel safe. His head is well supported and he will be reassured by maintaining the scent and warmth of his body in the mattress. Thanks to this, when the baby falls asleep in the topponcino, it becomes easier to put it down without waking him up. After feedback from personal experience, this washable model without a cover was created to avoid wrinkles and slippage of the cover while promoting the baby's hold and comfort. > Fabrics: 100% OEKO-TEX certified cotton. > Fleece: > Polyester fiber is + fluffy and dries + quickly > 330g organic cotton is + dense and breathable > 4 choices: - 1 cotton layer (~1 cm) - 2 layers of OEKO-TEX fiber (~1.5 cm) - 1 fiber layer & 1 cotton layer (~1.6 cm) - 2 cotton layers (~1.7 cm) > Interview: - Machine wash at 30°C and gentle spinning - Soft ironing - Drying and hand washing are not recommended